--- product_id: 4561739 title: "Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15\" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725)" brand: "transcend" price: "65741 kr" currency: ISK in_stock: true reviews_count: 13 category: "Transcend" url: https://www.desertcart.is/products/4561739-transcend-480gb-jetdrive-725-sataiii-6gb-s-solid-state-drive store_origin: IS region: Iceland --- # 6Gb/s SATA III speed 480GB high-capacity SSD USB 3.0 external enclosure Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) **Brand:** transcend **Price:** 65741 kr **Availability:** βœ… In Stock ## Summary > πŸš€ Upgrade your MacBook Pro storage and speed β€” because your workflow deserves the best! ## Quick Answers - **What is this?** Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) by transcend - **How much does it cost?** 65741 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/4561739-transcend-480gb-jetdrive-725-sataiii-6gb-s-solid-state-drive) ## Best For - transcend enthusiasts ## Why This Product - Trusted transcend brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Massive 480GB Capacity:** Expand your MacBook Pro’s storage with a spacious 480GB SSD, perfect for all your professional files and creative projects. - β€’ **Dual-Purpose Upgrade Kit:** Includes everything to upgrade your internal SSD and repurpose your original drive as a sleek external USB 3.0 SSD. - β€’ **Plug-and-Play Versatility:** Aluminum enclosure supports SuperSpeed USB 3.0 & Hi-Speed USB 2.0, ensuring fast, reliable connectivity anywhere. - β€’ **Blazing Fast Storage Upgrade:** Next-gen SATA III interface delivers up to 6Gb/s transfer speeds for seamless MacBook Pro performance boosts. - β€’ **Smart Monitoring at Your Fingertips:** Free JetDrive Toolbox software keeps your SSD health and performance optimized, so you never miss a beat. ## Overview The Transcend 480GB JetDrive 725 SSD Upgrade Kit is designed specifically for MacBook Pro 15" Retina models (Mid 2012 - Early 2013). Featuring a SATA III 6Gb/s interface, it offers a significant performance boost and expanded storage capacity. The kit includes a USB 3.0 aluminum enclosure to repurpose your original SSD as a fast external drive, plus free monitoring software to maintain peak SSD health. Ideal for professionals seeking reliable, high-speed storage upgrades with plug-and-play convenience. ## Description Introducing Transcend JetDrive SSD Upgrade Kit for the Macbook Air and MacBook Pro with Retina Display. Complete with tools, instructions, and a slick aluminum usb 3.1 Gen 1 Enclosure to house your original SSD, Transcend JetDrive SSD Upgrade Kit allows you to both increase your storage space and boost the performance of your Mac. Review: Excellent Value & Performance. Simple to Install. Complete Kit. Possibly Wise to Upgrade Sooner. TRIM can now be Enabled. - Mar 2015. This is a wonderful product and if you need the space, I highly recommend it along with the other reviewers who thoroughly cover it's excellent performance, value, simplicity of installation - watch the video - and well thought out features including a nice case for your old SSD drive. Transcend has really focused on the MacBookPro market and done a fantastic job. Unfortunately, when you first investigate this drive and try to decide if it is a good choice, you will immediately read that Yosemite does not support something called TRIM on third party SSD drives like the Transcend JetDrive. This is confusing and caused me to do a lot of research. Top Level Summary: if you need the space, I think the TRIM issue shouldn't be a factor in your decision. TRIM is desirable, but I think you can safely buy this drive and not worry about TRIM. If you are interested in the benefits of TRIM, the rest of this note explains how to safely and simply enable TRIM periodically. The best news is that even if you want the benefits of TRIM, there is no urgency as you can always run TRIM later whenever you want to. Two quick notes that I think add to the discussion: 1) Availability - it is probably wise to buy sooner rather than later because in it's most recent products, Apple is moving from SSD's with the SATA III interface to SSD's with the PCIe interface. The very specific nature of Transcend JetDrive means that it addresses a limited market: a SATA III interface SSD that will fit in a MacBookPro. The newest MacBookPro Retina now uses an SSD with a PCIe interface. As a result, if you are interested in upgrading the size of your MacBookPro SSD, it might be wise to buy this sooner rather than later, in case availability of a SATA III SSD that will fit in the MacBookPro becomes an issue as the PCIe SSD's become dominant in Apple's product line. 2) As others have pointed out, TRIM is important but not critical. You can buy this drive and not worry about TRIM. However, if you want to have the benefits of TRIM, a small amount of effort makes it possible. Unfortunately, Transcend can't supply this directly, but you can do it yourself quite easily. Long discussion on TRIM below: A1. Apple uses TRIM Mavericks and Yosemite continuously run TRIM on Apple supplied SSD's. However, for obvious but unwise business reasons, Apple will not run TRIM on third party SSD's. Hence to run TRIM on the JetDrive 725 will take you some additional steps. However, it is only necessary to run TRIM when you notice your SSD performance seems slow. This would likely happen only after a few months of normal use or when the drive starts to become full. In that case, with a small amount of effort, TRIM can be run as a batch process that TRIM's the entire disk. If you don't mind an occasional inconvenience, you can easily run it periodically as part of your normal usage patterns (once a month? twice a year?). A2. 960GB of Laptop Space is Great In my opinion, TRIM is probably not a reason to hesitate on purchasing this drive if you want the additional space. For example, if you use your MacBookPro for digital photography, a 960GB drive is extremely nice. With a Nikon D800 a "typical" photo shoot event runs me about 10 - 20 GB of raw photos before I can select out the photos that seem best. Also, I use Google Nik software filters, and because they use the lossless but horribly inefficient TIFF format, they create a 100MB copy of every one of the photos they touch. B1. TRIM is Important, Not Critical TRIM is important but it isn't critical. Even though Mavericks and Yosemite run TRIM continuously on Apple supplied SSD's, because of the nature of the kind of problem that TRIM is designed to solve, it doesn't have to run continuously. TRIM is only necessary if you notice your SSD performance isn't as good as when you first installed it. B2. TRIM using an Alternate Boot Disk - booting off of an SDHC or SDXC Flash drive Once TRIM is enabled, as Allan Marcus pointed out in his Mac OS X Hints post, it can be run in batch mode by Apple Disk Utility under the Repair Volume command. Note: Disk Utility cannot run TRIM without first enabling TRIM, so you have two tasks: create an alternate boot disk and then enabling TRIM on that boot disk. With a TRIM enabled Yosemite running on an inexpensive SDHC or SDXC Flash Drive, it is simple to use the normal Mac interface to occasionally (once a month? Twice a year?) run TRIM. Running TRIM periodically with Disk Utility requires an alternate boot drive, because Disk Utility unmounts the disk it is working on. It is possible to use the Apple Recovery Partition and "single user mode" to try to work around this, but it's not worth it. Keeping an inexpensive SDXC backup copy of your OS and Applications is probably a good practice anyway. B3. Copying Your OS and Applications to a Flash Drive One way to have the benefits of TRIM is to copy your Yosemite OS and Applications to an SD card flash drive. For that purpose, I used a 128 GB flash drive and Carbon Copy Cloner. My OS and Applications would easily fit within 64GB, but I used a 128GB card because I wanted the extra space and I liked the JetDriveLite form factor. B4. Once you have a bootable flash drive - Sequence to run a batch TRIM operation 0) backup your entire JetDrive. This is always a good idea because SSD's do fail. Make sure your MacBookPro is plugged into working AC power and your battery is already fully charged in case of a power outage. The steps you will follow are very benign, but backing up is always a good practice whenever you "touch" a disk. 1) set your startup volume to be the MacOS you copied onto a SDHC or SDXC flash drive and reboot 2) download (cindori.org Trim Enabler $10) and install ( this will install on your flash drive) 3) enable TRIM using the convenient TRIM Enabler control panel, 4) run Disk Utility to TRIM your drive - Open Disk Utility. Select your drive on the left pane, Click "Repair Disk." -- Is it dangerous to run Repair Disk on a healthy disk? No. Not unless you have a power interruption, so use AC power and run repair disk when your battery is fully charged. -- There are two philosophies: "don't fix what's not broken," and preventative care. Because filesystems are entirely deterministic, I think preventative care is the better choice. In principle, a Repair Disk operation can only discover inconsistencies, it cannot cause them. My experience from rotating platter HDD's includes filesystem inconsistencies ("B-trees" or mismatches in the numbers of allocated blocks) which were repaired. In at least two cases on old HDD's I needed Drive Genius to rebuild the directory table. In those cases I only lost one or two files, not the entire data set. My experience with SSD's is limited, but I have not seen those kind of errors on any SSD's I've used. I've had an Apple supplied SSD fail completely in my MacBookPro 15" Retina Early 2013, but luckily, I had a backup. -- So, unless a power interruption occurs (working AC power is important), repairing a healthy disk filesystem is a benign process. -- If you are unlucky enough to have major problems, the Repair operation may abort. If that happens, you need to switch your efforts from trying to get TRIM to run, to fixing the filesystem data on your SSD. Drive Genius is very useful in this case if you want to fix it yourself, but if not, take everything in to an Apple store or other experienced computer professional. If even Drive Genius is unsuccessful, you can always reformat your laptop SSD and restore from your backup, however in this case you may have an unreliable SSD and you might want to replace it. 5) toward the end of Repair Disk processing, you will see in the log the line "Trimming unused blocks" -- if you don't see that, then TRIM wasn't enabled and you need to check the TRIM Enabler control panel again to be sure you enabled TRIM. -- also, you can check "About This Mac" / "System Report" / "SATA/SATA Express" and look for "TRIM Support" -- If you install the Transcend utility, JetDriveToolbox, be aware that it is unintentionally misleading. Even when TRIM is not enabled in the MacOS, under "DRIVE" it says "Trim Command Supported" but that refers to the SSD controller in the JetDrive - not the full OS - so you can't use that to judge the status of TRIM on your computer. 6) when Repair Disk is completed, disable TRIM, -- this last step is important. you need to disable TRIM using the convenient TRIM Enabler control panel -- if you forget, it's not terrible, but you are leaving your system a little more vulnerable -- also, other users have reported in the forums a subtle result from "turning off" the Apple "signed kernel" protection. If you haven't used a clean install to put Yosemite on your computer ( I almost never use clean install), you might have old and incompatible MacOS extensions in your System folder. When Trim Enabler has enabled TRIM, it also changes a setting in the laptop nvram that tells Yosemite to ignore the "signed kernel" requirement. If you forget to disable TRIM, those old extensions will load and may cause subtle problems in other programs (like Airplay shows video but not audio). This is unlikely, but it did show up in some of the forums. 7) set your JetDrive 725 as the startup volume and reboot You are done. You can perform this sequence every now and then as a preventative measure or just wait until you think you are getting poor write performance out of your SSD. Finally, you don't have to run TRIM if you never notice your SSD performance isn't as good as when you bought it. Technically TRIM does help SSD "wear," but SSD manufacturers do not rely on TRIM for their longevity. In any event, it is absolutely not critical to run TRIM frequently, so you truly don't have to worry about TRIM unless you notice a performance problem . B5. Enabling TRIM for Third Party SSD's - Reference As cited by Rich in the desertcart Q&A section, the issues surrounding third party SSD's, Yosemite, and TRIM are explained in detail on http://www.cindori.org/trim-enabler-and-yosemite/ by Oskar Groth. This is well worth reading if you are interested. B6. Enabling TRIM for Third Party SSD's - What is TRIM and its importance? TRIM is an important capability and I wish Apple's policy on third party SSD solutions did not make this a concern. However, for anyone considering the wonderful Transcend JetDrive product and concerned about the question of TRIM, as I explained above, I am convinced that it is possible to run TRIM without a major inconvenience or risk. TRIM is "not required," but because an SSD write operation requires an earlier erase, it means that over time an SSD with normal activity will start to have lots of blocks of data that have been "deleted" in the MacOS, but not erased on the SSD by the SSD controller. SSD's aren't designed around a specific filesystem, so the SSD controller isn't built to understand any of the specifics of the MacOS filesystem. Even though the allocation tables the MacOS uses to assign and de-assign (or "delete") the blocks used by a particular file are stored on the SSD, the controller itself can't read or understand the allocation tables and does not know which SSD blocks the OS has marked as "deleted" and hence, are ready to erase. That is why finding which blocks toTRIM must be an Operating System function, not an SSD controller function. Eventually, as the number of "un-erased but deleted" blocks increase, the MacOS will start to have a significant number of writes that occur on blocks that require an erase cycle first, and write performance will suffer significantly on those writes. There are interesting details in how an SSD works, and to some extent the SSD moves data around on its own for longevity purposes (http://en.wikipedia.org/wiki/Write_amplification). As a consequence of moving the data, the likelihood of having lots of "un-erased but deleted" blocks is reduced. For this reason, TRIM may not be as necessary, however, it is factually true that any system capable of running TRIM does - including Apple's MacBookPro implementation of SSD's in Mavericks and Yosemite. The trick is that Apple has made it "more difficult" to run TRIM on third party SSD drives in Yosemite because of a new security feature. Yosemite's default is to only boot from a "kernel" that is "signed." A "signed kernel" means that Apple can guarantee that it is more difficult for malware to corrupt the basic operating system. Whether this is a good feature or not can be debated, but it seems desirable to me as one more small step at fighting off potential attacks on your computer. It seems clear that TRIM is very useful for most people over time, and one important point is that because it is a filesystem function, it can be invoked as a batch operation using Apple's Disk Utility. B7. Example Disk Utility Log (command line - you can use the GUI) Specifically, if you enable TRIM (Trim Enabler from cindori.org is one method) and run the Apple Disk Utility and select Repair Volume, the Disk Utility will trim the unused/deleted blocks by commanding the SSD controller to erase the list of blocks it sends. Transcript of a Trim session The command line below runs diskutil on the JetDrive volume labeled "myDrive" and mounted in my alternate boot Flash OS as /Volumes/myDrive. My setup is slightly more complicated as I split my jetDrive into two partitions. diskutil repairvolume /Volumes/myDrive Started file system repair on disk0s4 myDrive Repairing file system Checking Journaled HFS Plus volume Checking extents overflow file Checking catalog file Checking multi-linked files Checking catalog hierarchy Checking extended attributes file Checking volume bitmap Checking volume information Trimming unused blocks <---- this line shows that the MacOS TRIM operation has been run to tell the SSD which blocks on the volume are unused and need to be "erased" The volume Users appears to be OK File system check exit code is 0 Updating boot support partitions for the volume as required Finished file system repair on disk0s4 myDrive Review: Unusable on Windows without disabling LPM, and died after ~3 years - Update 2: Two years and nine months after purchase, the drive's partitions no longer appear and it is presumed dead. I suspect I may have exceeded the maximum write count by compiling Android on it a few times. ----- Update: Someone left a comment that fixes the drive on Windows, and now it's pretty snappy in both Windows and OS X. However, since it doesn't work out of the box I'm leaving off two stars. The "fix" works by disabling low power mode on Windows, so I imagine it may decrease battery life. ----- Here's desertcart user DS's original comment that fixes the issue: Had the same problem with Windows 10. The following solved it for me: 1. Open Device Manager to lookup the drive's device string (I have TS480GJDM725). 2. Turn off LPM by adding the device string to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storeahci\Parameters\Device\NoLPM (I added "TS480GJDM725*") 3. Restart. ----- Here's the original review (titled "Locks up in Windows 10 under Boot Camp"): I bought this drive two years ago so that I'd have enough storage to install OS X and Windows side by side while still having enough space for the raw audio and video associated with video and music production. On OS X 10.9-10.11, it performs as well as or better than the original drive even with FileVault enabled, so no complaints here. However, in Windows 10 (build 10586) it locks up every now and then for a few seconds or minutes at a time. In Chrome, this can mean the browser is stuck "Waiting for cache" for a very long time - sometimes so long that Chrome gives up on loading the page. UWP apps, like the Mail app, interpret this as the app being unresponsive and are occasionally forcibly closed. Other programs that normally take under a second to load can take minutes. This includes the Task Manager, which means I can't even kill the program that started the offending read request. This happens even if I disable BitLocker. That said, seeing that Windows detects this as a generic drive and uses the generic drivers, this could also very well be Microsoft's fault. Unfortunately, downgrading to Windows 8.1 (which has worked fine in the past) is not an option for me because of work requirements. ## Features - Compatible with MacBook Pro Retina 15" (Mid 2012, Early 2013) - Next-generation SATA III 6Gb/s interface - Free download of Jet Drive Toolbox SSD monitoring software - External enclosure is fully compatible with Super Speed USB 3.0 & Hi-Speed USB 2.0 - SSD upgrade kit included, Repurpose original SSD into external SSD - Dual color LED indicator (Power, data transfer and USB 3.0/2.0 connection) - Operating Temperature 32F-158F ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00LJO86NY | | Additional Features | Portable | | Best Sellers Rank | #3,246 in Internal Solid State Drives #63,774 in Computer Internal Components | | Brand | Transcend | | Built-In Media | Full unit | | Cache Memory Installed Size | 480 | | Color | Black | | Compatible Devices | Laptop | | Connectivity Technology | SATA, USB | | Customer Reviews | 4.2 out of 5 stars 428 Reviews | | Digital Storage Capacity | 480 GB | | Form Factor | 2.5-inch | | Global Trade Identification Number | 00760557830078, 04054843760528 | | Hard Disk Description | Solid State Drive | | Hard Disk Form Factor | 2.5 Inches | | Hard Disk Interface | USB 1.1 | | Hard-Drive Size | 480 GB | | Hardware Connectivity | SATA 3.0 Gb/s | | Hardware Platform | Mac | | Installation Type | External Hard Drive | | Item Part Number | TS480GJDM725 | | Item Weight | 2.24 ounces | | Manufacturer | Transcend | | Media Speed | 460 Megabytes Per Second | | Mfr Part Number | TS480GJDM725 | | Model Name | JetDrive 725 | | Model Number | TS480GJDM725 | | Number of Items | 1 | | Read Speed | 570 Megabytes Per Second | | Special Feature | Portable | | Specific Uses For Product | Personal | | UPC | 760557830078 012304674443 014444857434 | | Warranty Description | Five-year Limited Warranty | ## Product Details - **Digital Storage Capacity:** 480 GB - **Hard Disk Interface:** USB 1.1 - **Connectivity Technology:** SATA, USB - **Brand:** Transcend - **Special Feature:** Portable - **Hard Disk Form Factor:** 2.5 Inches - **Hard Disk Description:** Solid State Drive - **Compatible Devices:** Laptop - **Installation Type:** External Hard Drive - **Color:** Black ## Images ![Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) - Image 1](https://m.media-amazon.com/images/I/51nIfRAIbdL.jpg) ![Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) - Image 2](https://m.media-amazon.com/images/I/417wOzlkiNL.jpg) ![Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) - Image 3](https://m.media-amazon.com/images/I/41rWbEpn3-L.jpg) ![Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) - Image 4](https://m.media-amazon.com/images/I/51TcmXvOutL.jpg) ![Transcend 480GB JetDrive 725 SATAIII 6Gb/s Solid State Drive Update Kit for MacBook Pro 15" with Retina Display, Mid 2012 - Early 2013 (TS480GJDM725) - Image 5](https://m.media-amazon.com/images/I/51Gbikp1IXL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent Value & Performance. Simple to Install. Complete Kit. Possibly Wise to Upgrade Sooner. TRIM can now be Enabled. *by P***N on March 14, 2015* Mar 2015. This is a wonderful product and if you need the space, I highly recommend it along with the other reviewers who thoroughly cover it's excellent performance, value, simplicity of installation - watch the video - and well thought out features including a nice case for your old SSD drive. Transcend has really focused on the MacBookPro market and done a fantastic job. Unfortunately, when you first investigate this drive and try to decide if it is a good choice, you will immediately read that Yosemite does not support something called TRIM on third party SSD drives like the Transcend JetDrive. This is confusing and caused me to do a lot of research. Top Level Summary: if you need the space, I think the TRIM issue shouldn't be a factor in your decision. TRIM is desirable, but I think you can safely buy this drive and not worry about TRIM. If you are interested in the benefits of TRIM, the rest of this note explains how to safely and simply enable TRIM periodically. The best news is that even if you want the benefits of TRIM, there is no urgency as you can always run TRIM later whenever you want to. Two quick notes that I think add to the discussion: 1) Availability - it is probably wise to buy sooner rather than later because in it's most recent products, Apple is moving from SSD's with the SATA III interface to SSD's with the PCIe interface. The very specific nature of Transcend JetDrive means that it addresses a limited market: a SATA III interface SSD that will fit in a MacBookPro. The newest MacBookPro Retina now uses an SSD with a PCIe interface. As a result, if you are interested in upgrading the size of your MacBookPro SSD, it might be wise to buy this sooner rather than later, in case availability of a SATA III SSD that will fit in the MacBookPro becomes an issue as the PCIe SSD's become dominant in Apple's product line. 2) As others have pointed out, TRIM is important but not critical. You can buy this drive and not worry about TRIM. However, if you want to have the benefits of TRIM, a small amount of effort makes it possible. Unfortunately, Transcend can't supply this directly, but you can do it yourself quite easily. Long discussion on TRIM below: A1. Apple uses TRIM Mavericks and Yosemite continuously run TRIM on Apple supplied SSD's. However, for obvious but unwise business reasons, Apple will not run TRIM on third party SSD's. Hence to run TRIM on the JetDrive 725 will take you some additional steps. However, it is only necessary to run TRIM when you notice your SSD performance seems slow. This would likely happen only after a few months of normal use or when the drive starts to become full. In that case, with a small amount of effort, TRIM can be run as a batch process that TRIM's the entire disk. If you don't mind an occasional inconvenience, you can easily run it periodically as part of your normal usage patterns (once a month? twice a year?). A2. 960GB of Laptop Space is Great In my opinion, TRIM is probably not a reason to hesitate on purchasing this drive if you want the additional space. For example, if you use your MacBookPro for digital photography, a 960GB drive is extremely nice. With a Nikon D800 a "typical" photo shoot event runs me about 10 - 20 GB of raw photos before I can select out the photos that seem best. Also, I use Google Nik software filters, and because they use the lossless but horribly inefficient TIFF format, they create a 100MB copy of every one of the photos they touch. B1. TRIM is Important, Not Critical TRIM is important but it isn't critical. Even though Mavericks and Yosemite run TRIM continuously on Apple supplied SSD's, because of the nature of the kind of problem that TRIM is designed to solve, it doesn't have to run continuously. TRIM is only necessary if you notice your SSD performance isn't as good as when you first installed it. B2. TRIM using an Alternate Boot Disk - booting off of an SDHC or SDXC Flash drive Once TRIM is enabled, as Allan Marcus pointed out in his Mac OS X Hints post, it can be run in batch mode by Apple Disk Utility under the Repair Volume command. Note: Disk Utility cannot run TRIM without first enabling TRIM, so you have two tasks: create an alternate boot disk and then enabling TRIM on that boot disk. With a TRIM enabled Yosemite running on an inexpensive SDHC or SDXC Flash Drive, it is simple to use the normal Mac interface to occasionally (once a month? Twice a year?) run TRIM. Running TRIM periodically with Disk Utility requires an alternate boot drive, because Disk Utility unmounts the disk it is working on. It is possible to use the Apple Recovery Partition and "single user mode" to try to work around this, but it's not worth it. Keeping an inexpensive SDXC backup copy of your OS and Applications is probably a good practice anyway. B3. Copying Your OS and Applications to a Flash Drive One way to have the benefits of TRIM is to copy your Yosemite OS and Applications to an SD card flash drive. For that purpose, I used a 128 GB flash drive and Carbon Copy Cloner. My OS and Applications would easily fit within 64GB, but I used a 128GB card because I wanted the extra space and I liked the JetDriveLite form factor. B4. Once you have a bootable flash drive - Sequence to run a batch TRIM operation 0) backup your entire JetDrive. This is always a good idea because SSD's do fail. Make sure your MacBookPro is plugged into working AC power and your battery is already fully charged in case of a power outage. The steps you will follow are very benign, but backing up is always a good practice whenever you "touch" a disk. 1) set your startup volume to be the MacOS you copied onto a SDHC or SDXC flash drive and reboot 2) download (cindori.org Trim Enabler $10) and install ( this will install on your flash drive) 3) enable TRIM using the convenient TRIM Enabler control panel, 4) run Disk Utility to TRIM your drive - Open Disk Utility. Select your drive on the left pane, Click "Repair Disk." -- Is it dangerous to run Repair Disk on a healthy disk? No. Not unless you have a power interruption, so use AC power and run repair disk when your battery is fully charged. -- There are two philosophies: "don't fix what's not broken," and preventative care. Because filesystems are entirely deterministic, I think preventative care is the better choice. In principle, a Repair Disk operation can only discover inconsistencies, it cannot cause them. My experience from rotating platter HDD's includes filesystem inconsistencies ("B-trees" or mismatches in the numbers of allocated blocks) which were repaired. In at least two cases on old HDD's I needed Drive Genius to rebuild the directory table. In those cases I only lost one or two files, not the entire data set. My experience with SSD's is limited, but I have not seen those kind of errors on any SSD's I've used. I've had an Apple supplied SSD fail completely in my MacBookPro 15" Retina Early 2013, but luckily, I had a backup. -- So, unless a power interruption occurs (working AC power is important), repairing a healthy disk filesystem is a benign process. -- If you are unlucky enough to have major problems, the Repair operation may abort. If that happens, you need to switch your efforts from trying to get TRIM to run, to fixing the filesystem data on your SSD. Drive Genius is very useful in this case if you want to fix it yourself, but if not, take everything in to an Apple store or other experienced computer professional. If even Drive Genius is unsuccessful, you can always reformat your laptop SSD and restore from your backup, however in this case you may have an unreliable SSD and you might want to replace it. 5) toward the end of Repair Disk processing, you will see in the log the line "Trimming unused blocks" -- if you don't see that, then TRIM wasn't enabled and you need to check the TRIM Enabler control panel again to be sure you enabled TRIM. -- also, you can check "About This Mac" / "System Report" / "SATA/SATA Express" and look for "TRIM Support" -- If you install the Transcend utility, JetDriveToolbox, be aware that it is unintentionally misleading. Even when TRIM is not enabled in the MacOS, under "DRIVE" it says "Trim Command Supported" but that refers to the SSD controller in the JetDrive - not the full OS - so you can't use that to judge the status of TRIM on your computer. 6) when Repair Disk is completed, disable TRIM, -- this last step is important. you need to disable TRIM using the convenient TRIM Enabler control panel -- if you forget, it's not terrible, but you are leaving your system a little more vulnerable -- also, other users have reported in the forums a subtle result from "turning off" the Apple "signed kernel" protection. If you haven't used a clean install to put Yosemite on your computer ( I almost never use clean install), you might have old and incompatible MacOS extensions in your System folder. When Trim Enabler has enabled TRIM, it also changes a setting in the laptop nvram that tells Yosemite to ignore the "signed kernel" requirement. If you forget to disable TRIM, those old extensions will load and may cause subtle problems in other programs (like Airplay shows video but not audio). This is unlikely, but it did show up in some of the forums. 7) set your JetDrive 725 as the startup volume and reboot You are done. You can perform this sequence every now and then as a preventative measure or just wait until you think you are getting poor write performance out of your SSD. Finally, you don't have to run TRIM if you never notice your SSD performance isn't as good as when you bought it. Technically TRIM does help SSD "wear," but SSD manufacturers do not rely on TRIM for their longevity. In any event, it is absolutely not critical to run TRIM frequently, so you truly don't have to worry about TRIM unless you notice a performance problem . B5. Enabling TRIM for Third Party SSD's - Reference As cited by Rich in the Amazon Q&A section, the issues surrounding third party SSD's, Yosemite, and TRIM are explained in detail on http://www.cindori.org/trim-enabler-and-yosemite/ by Oskar Groth. This is well worth reading if you are interested. B6. Enabling TRIM for Third Party SSD's - What is TRIM and its importance? TRIM is an important capability and I wish Apple's policy on third party SSD solutions did not make this a concern. However, for anyone considering the wonderful Transcend JetDrive product and concerned about the question of TRIM, as I explained above, I am convinced that it is possible to run TRIM without a major inconvenience or risk. TRIM is "not required," but because an SSD write operation requires an earlier erase, it means that over time an SSD with normal activity will start to have lots of blocks of data that have been "deleted" in the MacOS, but not erased on the SSD by the SSD controller. SSD's aren't designed around a specific filesystem, so the SSD controller isn't built to understand any of the specifics of the MacOS filesystem. Even though the allocation tables the MacOS uses to assign and de-assign (or "delete") the blocks used by a particular file are stored on the SSD, the controller itself can't read or understand the allocation tables and does not know which SSD blocks the OS has marked as "deleted" and hence, are ready to erase. That is why finding which blocks toTRIM must be an Operating System function, not an SSD controller function. Eventually, as the number of "un-erased but deleted" blocks increase, the MacOS will start to have a significant number of writes that occur on blocks that require an erase cycle first, and write performance will suffer significantly on those writes. There are interesting details in how an SSD works, and to some extent the SSD moves data around on its own for longevity purposes (http://en.wikipedia.org/wiki/Write_amplification). As a consequence of moving the data, the likelihood of having lots of "un-erased but deleted" blocks is reduced. For this reason, TRIM may not be as necessary, however, it is factually true that any system capable of running TRIM does - including Apple's MacBookPro implementation of SSD's in Mavericks and Yosemite. The trick is that Apple has made it "more difficult" to run TRIM on third party SSD drives in Yosemite because of a new security feature. Yosemite's default is to only boot from a "kernel" that is "signed." A "signed kernel" means that Apple can guarantee that it is more difficult for malware to corrupt the basic operating system. Whether this is a good feature or not can be debated, but it seems desirable to me as one more small step at fighting off potential attacks on your computer. It seems clear that TRIM is very useful for most people over time, and one important point is that because it is a filesystem function, it can be invoked as a batch operation using Apple's Disk Utility. B7. Example Disk Utility Log (command line - you can use the GUI) Specifically, if you enable TRIM (Trim Enabler from cindori.org is one method) and run the Apple Disk Utility and select Repair Volume, the Disk Utility will trim the unused/deleted blocks by commanding the SSD controller to erase the list of blocks it sends. Transcript of a Trim session The command line below runs diskutil on the JetDrive volume labeled "myDrive" and mounted in my alternate boot Flash OS as /Volumes/myDrive. My setup is slightly more complicated as I split my jetDrive into two partitions. diskutil repairvolume /Volumes/myDrive Started file system repair on disk0s4 myDrive Repairing file system Checking Journaled HFS Plus volume Checking extents overflow file Checking catalog file Checking multi-linked files Checking catalog hierarchy Checking extended attributes file Checking volume bitmap Checking volume information Trimming unused blocks <---- this line shows that the MacOS TRIM operation has been run to tell the SSD which blocks on the volume are unused and need to be "erased" The volume Users appears to be OK File system check exit code is 0 Updating boot support partitions for the volume as required Finished file system repair on disk0s4 myDrive ### ⭐⭐⭐ Unusable on Windows without disabling LPM, and died after ~3 years *by A***A on September 7, 2016* Update 2: Two years and nine months after purchase, the drive's partitions no longer appear and it is presumed dead. I suspect I may have exceeded the maximum write count by compiling Android on it a few times. ----- Update: Someone left a comment that fixes the drive on Windows, and now it's pretty snappy in both Windows and OS X. However, since it doesn't work out of the box I'm leaving off two stars. The "fix" works by disabling low power mode on Windows, so I imagine it may decrease battery life. ----- Here's Amazon user DS's original comment that fixes the issue: Had the same problem with Windows 10. The following solved it for me: 1. Open Device Manager to lookup the drive's device string (I have TS480GJDM725). 2. Turn off LPM by adding the device string to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storeahci\Parameters\Device\NoLPM (I added "TS480GJDM725*") 3. Restart. ----- Here's the original review (titled "Locks up in Windows 10 under Boot Camp"): I bought this drive two years ago so that I'd have enough storage to install OS X and Windows side by side while still having enough space for the raw audio and video associated with video and music production. On OS X 10.9-10.11, it performs as well as or better than the original drive even with FileVault enabled, so no complaints here. However, in Windows 10 (build 10586) it locks up every now and then for a few seconds or minutes at a time. In Chrome, this can mean the browser is stuck "Waiting for cache" for a very long time - sometimes so long that Chrome gives up on loading the page. UWP apps, like the Mail app, interpret this as the app being unresponsive and are occasionally forcibly closed. Other programs that normally take under a second to load can take minutes. This includes the Task Manager, which means I can't even kill the program that started the offending read request. This happens even if I disable BitLocker. That said, seeing that Windows detects this as a generic drive and uses the generic drivers, this could also very well be Microsoft's fault. Unfortunately, downgrading to Windows 8.1 (which has worked fine in the past) is not an option for me because of work requirements. ### ⭐⭐⭐⭐ Great alternative to the OWC to increase storage in MacBook Pro Retina at a very good price. *by E***E on March 25, 2015* This is one of the few options to upgrade the SSD hard drive capacity of the Retina Macbook Pro (OWC is the other alternative). I chose this over OWC because it comes with the external case to house your current/old SSD plus the tools at the same price as the OWC one without. I've had this for about a month now, and overall it's a solid replacement and works well. I can't comment on speed/benchmarks, but I'm sure you can find plenty of those on professional tech websites and magazines. The actual swapping of the drive is really simple: unscrew the pentalobe screws on the Macbook Pro with the provided tool (keeping track of which screws came out of where, since there are 3 different sizes). Open the computer, then remove the black torx (or hex?) screw with the other tool. Slide out the old SSD, put in the new SSD, screw it back on. Screw the case screws back on. Put the old one into the included case and screw that close. Done. I tried to move my old Windows partition (was using Bootcamp) to the new drive, but it doesn't work that well, not with the stock Disk Utility. You probably need to buy an actual software that does this. Even when I copied the partition, it wouldn't boot to Windows (the contents are there), and I couldn't change the partition size (the Windows partition was 100GB I believe-- I couldn't make it 200). It has to do with the way the boot partion works on Windows. There were some ways to fix it I found on the web, but seems like a lot of trouble, especially considering that I don't have much data saved on the Windows partition (cloud storage FTW!). So I just repartitioned the new JetDrive SSD the way I wanted it (Windows/MacOS) and reinstalled MacOS and Windows in their respective partitions. Your situation and mileage may differ. I will say that if you have a 100% MacOS drive without any Windows partition, then moving your old data/program/files to the new drive will work easily via the instructions they provide to copy the drive via Disk Utility. The universe never intended Macbooks to run Windows, hehe... In conclusion, for the price, this is a great way to upgrade your SSD hard drive capacity in your MacBook Pro Retina. I wish they had one for my MacBook Air; hopefully soon. I think about 500GB SSD is ideal for me because I have a lot of files in the cloud, but also a lot of local files too. ## Frequently Bought Together - Transcend 480GB JetDrive 725 SATA III 6Gb/s Solid State Drive SSD Upgrade Kit for Mac TS480GJDM725 - Samsung SSD 870 EVO, 1 TB, Form Factor 2.5 and rdquo;, Intelligent Turbo Write, Magician 6 Software, Black (Internal SSD) - Crucial MX500 1TB 3D NAND SATA 2.5 Inch Internal SSD - Up to 560MB/s - CT1000MX500SSD1 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.is/products/4561739-transcend-480gb-jetdrive-725-sataiii-6gb-s-solid-state-drive](https://www.desertcart.is/products/4561739-transcend-480gb-jetdrive-725-sataiii-6gb-s-solid-state-drive) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-05-24*