Seagate 4TB IronWolf Internal NAS Hard Drive | SATA 6 Gb/s (ST4000VNZ06)

This review is for the Seagate IronWolf 4Tb model. Amazon groups reviews for drives of varying capacities for the same model family together, so hence the clarification. My first experience of a Seagate internal drive was when I purchased the 8Tb Ironwolf a couple months back (See my review here on Amazon). Since then, the drive has functioned perfectly. That drive is being used in my NAS and since the review of that drive, I have upgraded my 13 year old NAS to a new unit. However, i recently reached a point where I was running low on space on my existing 4 WD Red 4Tb drives, so wanted to add another WD Red 40EFRX model. Searching Amazon and other resellers, I couldn't find this exact model available any more, since being replaced by the WD Red Plus 40EFZX. I wanted matched drives, despite my new NAS using a RAID implementation not demanding this. However, being perhaps old fashioned, I really wanted identical drives. What to do? Well, I could add value to my old NAS by installing the 4 WD Red's I have and sell it. With that goal in mind, I looked to replace the WD's with new 4Tb Ironwolf's. Having been impressed with the 8Tb Ironwolf I have as a stand alone drive in my NAS, I was further tempted by the 20% cheaper 4Tb Ironwolf's compared to the WD Red Plus equivalents, no mean saving when looking to purchase 5 of them! Amazon was selling the Seagate Ironwolf's for just £80 at the time of purchase. This was just too good a deal to ignore, so I purchased 3 of them. Oddly, and something I've never encountered before, Amazon was restricting my purchase to a maximum of just 3. There appeared no stock limitations to account for this, though. That put me in a pickle, but thankfully the wife had her own Amazon account and so I was able to obtain the remaining couple of drives at the aforementioned excellent price. So, how do these compare to my old WD's? Before that, a word on packaging. I've read a few reviews on Amazon complaining about how Amazon ship drives. Be assured that all 5 of the drives ordered, as well as the 8Tb one a couple of months back, all arrived in robust boxes. Perhaps the most surprising thing about these 4Tb Ironwolf's is their size. They are noticeably smaller and lighter than my old WD's. The casing appears slimmer, especially towards the connector end of the drive. They still conform to standards, so will fit into systems, but I'd never seen a drive so noticeably different in its size before. The WD drives definitely feel heavier and more solid, but they are 5 years old, so perhaps use more platters to achieve the same capacity, I'm not sure. I haven't benchmarked these drives, but I understand these Ironwolf's are faster than their WD counterparts and are, of course, all CMR type drives. They also boast an impressive cache size for such a relatively low capacity drive at 256Mb. The newest WD equivalent offers half of that, The Ironwolf also runs around 20MB/sec faster transfer rate at around 200 Megabytes/sec compared to my older WD's. These 5 new drives have all gone through many hours of cloning functions as I sequentially replaced each WD in my array with a new Ironwolf and then an 18.5 hours RAID expansion when adding the fifth drive. All has gone well. These drives run cool and quiet, although they are still noisier than my old WD's. I can hear the seek on these where I was unable to hear anything on the WD's I had before. Nothing major at all, but noteworthy all the same. On a slight tangent, when discussing noise levels, the 8Tb Ironwolf I do have ticks away when idle. It makes a click sound about every 6 seconds or so, so that may bother those seeking a higher capacity model in quiet environments. However, this characteristic is shared with my external 14Tb WD Elements drive, so I believe this clicking is a function of higher capacity drives. The 4Tb drives reviewed here do not exhibit such clicking sounds when idle an spinning. My new NAS now uses a pair of 120mm fans as opposed to the single on the old NAS. This appears to keep drive temperatures nice and low, even the 8Tb 7,200rpm Iron Wolf I was slightly concerned about when running in my old NAS, the temperature differential so far being only an extra 2 or 3C over the 5,400rpm Ironwolfs in the new NAS. For those like me installing these 4Tb Ironwolf's into their Synology NAS's, a word of warning. On my DSM 7.1 system, these new 4Tb Ironwolf's(Model: ST4000VNZ06) appear not to have the Seagate Ironwolf health Management feature available to DSM. The 8Tb IronWolf I have has this feature show up fine in DSM 7.1. As far as I know, IHM (IronWolf Health management) is a feature of all IronWolf drives, but I may be wrong on that front. Either way, if this model does come with that feature, Synology's DSM 7.1 currently cannot recognize it, so you will be limited to only an S.M.A.R.T test option on those. Other than that, those Seagate IronWolf 4Tb drives still offer excellent value for money and, so far, the 5 I have are working fine. As on my 8Tb review, I will update this one should any of the drives fail within, or soon after, the 3 year warranty period. In summary, these 4Tb IronWolf drives offer exceptional value for money along with excellent performance. At current prices, they are a tempting option for those wanting a desktop hard drive in the form of the WD Blue or Seagate Barracuda ranges. You will get superior performance and better reliability with these over their desktop counterparts.

few random info i want to share this is made for 24/7 use. I brought 20TB for cold storage but the ideea is that if you buy it to play off it or few times per week use, then you are risking to damage it since it's not made to turn off and turn on, that is the Green one (baracuda) for, and the blue (sky something bird) is made to also go 24/7 but that one is for video registration and not play data. Aka you need to chose based on your reason to buy. Like the Exo, those are over kill unless you do need for a company. Also very noisy. The pro is better then the non pro so i will say it from now that if you just want a temporary HDD you are better to get an ssd or the firecuda (a combination of ssd and hdd). This unit has better tehnology to survice. even if you use it once per month or less, ensure you do use it more then 2 times per years since the lubrifier might dry out otherwise and you can't open this case unless you have a special way to rebuild it. The noise level is larger because performance and such was chosen over quiteness. and again, the green barracuda is better if noise is an issue. Also the green and the blue are using les electricity while this one uses more, way more. Did you see this one says 7.200 RPM? that is how fast the unit is. Meaning if you see a Iron Wolf Pro that has 5k something, that one is still an iron wolf pro but an older version but maybe it's better for you? Anyways, i mentioned this because there are a lot of mix ups when people buy a 7.200 RPM and get the more older model that is good, but not as good. Speaking of mix ups: be carefull that even if it's new, it might not be new since a lot of scammers are take used ones, use software and such to create false information the hard drive will give, and sell them as New. You then get it, check it quickly, no issues, and that is just because as i said, they do something with it. And then? It breaks, and you find out your product does not even have warrenty. as in, it's very importand who you buy it from, where you are buy it from. The 5 years warrenty and the 3 years data recovery only are valid if it's new, and sold by a Seagate aproved. Aka if you find this pro online, it does not matter if they are brand new, because if seagate did not aprove of the seller and that person sells them, it means that those are either "refurnised sold as new" or stolen ones. Speaking of scammers: buy external hardrive is even riskier since some buy, exchange, then return.... if not even the employee themselfs... and the person who buys it next will be accused of fraud since the check on the hardrives shows it's a different one then it should. Now, when i got the 20TB i was very worried since it came in an brown box, and has just a label?? i filmed me opening <- ensure you are covering everything since any scamer will just accuse you of being the scamer like: exchange new with old, and now want refund/replacement There needs to be a sealed bad that is transparent. Keep that bag very safe since it's anti statick so be carefull to keep it because one mistake and you touch the hardrive and all the data is gone <- wash hands, let them dry, touch something metalic, if you get electrocuted, you just prevented killing your hard drive. Avoid chloding, or anything like that, even rubber (latext) grolves. And again, you only need clean hands, since the anti static gloves are for people who build a pc or similar cases where they know even better. the sealed bag, that should 100% be sealed, as mentioned, it's transparent enough to see through and get the SN (serial number). Before opening the bag, register your device on seagate since that will help you. Why? some of the scammers sell devices (probably stolen?) from different regions and sell it to you but the warrenties and such are region base so it might not be valid just because you are in the wrong region. also, if you register your product, then you film that you have that device, then that you open it, this is further copy of non tempering since the device with the SN on it, is still sealed in the bag, and only open after while ensuring you keep filming since scamers will jsut say you reglued the stiker to an old one <- aka exactly what they actually did. Also, if anything seems off from the start, don't even open the bag. also seagate cs BTW: the registering the product is very important because thiefs exist. You are covered, and most of all, you have verified it's warrenty. also important, is to get a good case for this since it gets easily hot. A lot of people wonder Seagate vs WD vs others. Honestly, the only time it matters is if you know what you are looking for and one or the other, don't have said hdd avalable. Otherwise? there is no difference with the devices themselfs. So what then? it's the warrenty, how long, data recovery (this is why get pro and not the non pro) included for 3 years, and less people online saying how they like WD better when the same arguments and "statistics" exist reverse. Ensure you are verifiyng the hard drive via softwares and such. if you buy the 20 TB or more, keep in mind that a ful test will take anywhere from half a day to 2 day ish. Regarding the case, ensure it's Sata 3.5 inch compatible. Because most of the laptops and such are only 2.5 so don't look just at the price. Also it needs to be SATA, because even if a device is 3.5 inch, if it's not SATA then it's something else and that case is not good for this internal hard drive. Moiser that is to high or to low will damage it. Aka dry lips, or dry eyes, or dry through, do you get what i mean? we too are constantly "wet" but not to the level where we drown <- btw, if you ever jump out from a plain or so, be carefull of clouds since death via drowning is real since everywhere is a gas full of water. And this is where i want to get: storing it. You need to be carefull that it's not to wet or else rush. And i hopeyou always rember the cloud exemple that it does not matter if it's in water or not, water exist in air and that is why you need to seal it if not used. on the same ideea is dust. Also the more you use a hdd the more it vibrates causing damage to itself... well this is why, once again, buy the pro and not the non pro because the pro has anti vibration so you can use it without it wearing itself out. when you plug it in for the 1st time, you will not see the hardrive since you need to open storage and stuff to configurate <- i intentionally did not say all the details so you get an ai to tell you, also yes, it does not need to be paid ai i just want to make sure someone is "helping". also the exFAT means you can connect this driver to anything and it will work. Downside? any issue, like the cable got disconnected, then the hardrive's content get's corrupted. While the other one, NTLF or whatever it's called, is not really for general use, like it might not be compatible with non windows devices. However that one is safer since it does a log of what is going on so it won't forget what you did . Regarding the forget. When you delete files, pc, hardrive, phone, so on, you are not actually removing the file, all you do is disconnect it so that nothing can see it anymore. And once you put new files, those files will be covered and now really removed. Or to put it differently, the data recovery work because your files still exist, but they are pieces and can't be easily found (imagen a glass bowl that shattered and now you need to find everything. and above is also important if you plan to sell the hardrive in case you had private or otherwise information because they still exist on it. Aka fill up the hardrive with junk before selling, plus like this you'll have proof you did not scam. Regarding the format: quick format is quick because it just disconnect the files from the device but the files still exist. A full format, is when everything, every last thing is scanned, as such of course using it for the 20TB will take more then 12 hours, if not way more. Anyways, i hope this helps some people because the 20 TB is not only very expensive, you definitly do want to ensure you know as much as possible how to ensure you can buy this product, mentally and otherwise, prepered since please don't forget. One single mistake, it's gone. This is why it's always better to get spare ones, even if second hand, and any personal folder, once you encrypted, to be in a cloud storage but again, encrypt it, since hackers might "break in" and take your files, crak passwords and zips, so encrypting the file is very important. But otherwise? this 20 TB will be very good for many year to come!

I bought the Seagate IronWolf Pro 16TB for my NAS setup, and it's exactly what I needed—reliable, spacious, and enterprise-grade through and through. First off, 16TB of storage is a glorious amount of space. I’ve loaded mine with Plex media, backups, and surveillance recordings, and still have room to breathe. This is proper CMR technology (not the dodgy SMR stuff), which is a must for RAID performance and data integrity. The 7200 RPM speed and 256MB cache make a noticeable difference, especially in multi-user environments. Transfers are fast, consistent, and there's no lag when indexing large volumes of data. It runs smoothly in my Synology NAS with zero fuss. Noise and vibration levels are surprisingly reasonable for such a large-capacity drive. It’s not silent (it’s spinning 7,200 RPM after all), but Seagate’s vibration dampening tech is doing its job well. Temps stay in check too. Bonus points for: RAID optimization – it just works Data Rescue Services included – peace of mind in case disaster strikes Frustration-Free Packaging – arrived safely, minimal waste, no nonsense Final thoughts: If you're serious about long-term storage, RAID setups, or just want a rock-solid drive that won’t blink under pressure, the IronWolf Pro series is well worth the investment. Yes, it’s not cheap—but this isn’t your bargain-bin hard drive. It’s a heavy-duty workhorse made for people who care about their data. Highly recommended for NAS users, small business setups, or any data hoarder with standards.

Amazing how much storage one needs these days. Hard to remember that years ago I had everything I needed to keep on 10 floppy disks. Now on my 4th Ironwolf 4tb drive. Ironwolf are a great line from Seagate in my opinion. Quiet, fast, reasonably priced and reliable. My go-to brand for external hard drives

I needed to upgrade the disks in my TerraMaster NAS from 2tb (RAID 1), so, I opted to increase capacity to 6tb. I previously used 2x Toshiba N300 drives. These are relatively quick being 7200rpm but are very noisy. As such, I chose these 6tb Seagate Iron Wolf NAS drives. They are nominally a tad slower as they are 5400rpm devices but, in real life, I see no difference in performance - probably due to a larger on-board cache (256 vs 128mb). They are also very much quieter and the TerraMaster NAS specifically supports the Iron Wolf health monitoring features. The drives arrived well packaged and it was a simple task of inserting them into the NAS and recovering the Volume (one disk and then the other). I then edited the Volume to increase the size to 6tb. The process does take time as recovery was about 10 hours per drive (ie. 20 hours total). Unfortunately, everything went well until a next day catastrophic failure of one of the drives. The device made a continuous hunting noise and was shown as bad by the NAS. The good news was that a call to Amazon product support resulted in a free replacement being sent for next morning delivery and a return label emailed for the bad disk. The new disk arrived as promised and works perfectly - albeit after another lengthy volume rebuild. So, annoying but I can have no complaints about the service from Amazon! Let's hope it was a one-off failure. Time will tell....... Anyway, despite the setback, thus far, I am rather chuffed 😀 😊

I bought 5 of these, 4 of which are running in a raidz2 and the 5th as a spare. They have been running 24/7 for almost 2 years with no issues. They run around 45°C day in, day out. I would not hesitate to buy them again, but not at the stupid prices they are currently sold for. But once they drop to sub £100 prices once again, I would have no problem recommending them to anyone building a redundant array for a home server.

I grabbed the IronWolf Pro 8TB because my NAS was running out of room, and honestly, it’s been spot‑on. Slotted it in, powered up, and it was recognised straight away with no fuss. It’s been running quietly in the background ever since, doing exactly what I needed it to do. Nothing flashy, nothing dramatic — just a reliable, fast drive that gives me the extra storage I needed. If you’re expanding your NAS and want something dependable that you don’t have to think about again once it’s installed, this one’s been great for me.

Let me start by saying: this is exactly what I needed for my multi-bay NAS setup. What I love: • Optimized for NAS performance. With AgileArray technology, dual‑plane balancing, rotational‑vibration (RV) sensors, and TLER, it delivers seamless RAID performance even in busy multi-drive environments. • Always‑on reliability. Built for 24/7 operation with an enterprise-grade 550 TB/year workload rating and an impressive 2.5 million hours MTBF. • Peace‑of‑mind warranties and recovery. Comes with a 5‑year limited warranty plus 3 years of Rescue Data Recovery service—nice knowing data recovery is covered. • Healthy NAS integration. IronWolf Health Management means your compatible NAS can monitor the drive’s condition and raise alerts proactively.  • Strong performance specs. SATA III interface, 7200 RPM, and a beefy 256 MB cache keep things speedy and responsive. All in all, it’s rock-solid, enterprise-level quality housed in a consumer-ready 3.5″ form. Any downsides? • Spinning rust limitations. It obviously can’t match SSD speeds, but for mass storage, video archives, or backup—it’s still very fast. • Price per TB. It’s a premium product, so if budget is tight or you’re only building for light tasks, other options offer value. Final verdict: If you want a reliable, NAS-friendly drive with enterprise backing and peace of mind, the Seagate IronWolf Pro 8 TB is a standout. Perfect for creative professionals, small businesses, or serious home users who demand uptime and robustness. Highly recommend!

Package arrived early. No issues with it. Used this to upgrade my parity disk in Unraid

So far so good. 775€ was a good price for 24tb. Now they are way to expensive. It fits good in my ugreen Ai nas idx6011 but need more disk soon 😜😋

Chi gestisce un NAS sa che il risparmio sugli hard disk è un rischio che non vale la pena correre. Ho scelto questo Seagate IronWolf Pro da 8TB (modello ST8000NTZ01) per aggiornare il mio array RAID, e le differenze rispetto alla serie standard o ai drive desktop sono evidenti sin dai primi test di stress. 🛡️ TECNOLOGIA E AFFIDABILITÀ Il punto di forza di questo disco è la tecnologia CMR (Conventional Magnetic Recording). In un ambiente NAS, dove i riscritture sono frequenti, evitare i dischi SMR è fondamentale per non avere cali drastici di performance durante le ricostruzioni RAID o i backup pesanti. Sensori RV (Rotational Vibration): Essendo la versione Pro, include sensori per gestire le vibrazioni rotazionali. Nel mio case a 4 bay, questo garantisce che le vibrazioni dei dischi adiacenti non influenzino la precisione della testina, prolungando la vita del drive. Carico di lavoro: Certificato per 550 TB/anno, è un mulo da lavoro instancabile, ben oltre le necessità di un utente domestico avanzato. 🚀 PERFORMANCE REALI Velocità: I 7200 RPM e la cache da 256 MB si fanno sentire. Nei trasferimenti sequenziali ho saturato stabilmente la banda della mia rete Gigabit, mantenendo medie intorno ai 240-250 MB/s in lettura/scrittura sequenziale. Rumorosità e Calore: Nonostante i 7200 giri, il disco è sorprendentemente silenzioso durante il normale funzionamento (si sente il classico "grattare" solo durante i seek pesanti). La temperatura operativa in un case ben ventilato si è assestata sui 36-38°C sotto carico. 💎 IL VALORE AGGIUNTO: DATA RESCUE Un dettaglio che spesso si ignora finché non è troppo tardi: inclusi nel prezzo ci sono 3 anni di Rescue Data Recovery Services. Sapere che Seagate offre il recupero dati professionale in laboratorio in caso di guasto meccanico aggiunge un livello di tranquillità che giustifica il sovrapprezzo rispetto alla serie IronWolf liscia. ✅ PRO E ❌ CONTRO PRO: Tecnologia CMR (indispensabile per RAID); 3 anni di recupero dati inclusi; prestazioni al vertice della categoria 3.5"; Garanzia di 5 anni. CONTRO: Prezzo superiore ai drive consumer; leggermente più udibile rispetto ai modelli a 5400 RPM (normale per un drive Enterprise). 💡 CONSIGLIO TECNICO Appena arrivato, consiglio sempre un test completo della superficie (Extended Smart Test) prima di inserirlo nel volume RAID. La confezione FFP (Frustration-Free Packaging) di Amazon è ottima: il disco è arrivato sospeso in una struttura di plastica rigida e cartone, protetto perfettamente dagli urti del corriere. GIUDIZIO FINALE: È il "Gold Standard" per chiunque prenda sul serio i propri dati. Che sia per un server multimediale Plex o per backup aziendali, l'IronWolf Pro è una garanzia di continuità operativa.

Arrived all the way from England after a 2 week delivery and the unit was Dead On Arrival (DOA) had to return for a credit. Very disapointing!

I bought a 4TB Seagate Ironwolf drive to replace a WD drive I had that was giving errors in my UNRAID server. I have not bought a Seagate drive in a very long time. There was a period of time when Seagate was great, then a period of time when they were not so great. Anyway, I figured I would give Seagate a try again, especially since their drive was $15 cheaper than the same WD drive at the time. I received my drive and it was well packaged in protective packaging and inside a box. The drive had the same familiar footprint dimensions but was a shorter height which was interesting. Anyway, it didn't make a difference really. I removed my failing WD drive from the server, and then slotted this seagate drive in. I then started the server and once booted I assigned the drive to the correct slot in the menu and the server immediately began rebuilding the data on the new seagate drive. The drive had zero issues and zero errors on it from testing and rebuilding. It delivers good read/write speeds, but read/write speeds are really dependent upon many factors and what the server is doing at the time and so forth, so no detailed reports on that. The Seagate drive has been running 24/7 on my server for about a month now and not a single issue with it so far. The shorter height is interesting as it lets more air from the front facing fans pass between it and the drive above it, so that is a plus I suppose. If this drive holds up for 6+ months I will probably replace more of my server drives with Seagate drives. I have 2 other server drives coming on replacement time in near while, so I will be purchasing at least a couple more of these as they go on sale from time to time. I will need to compare the longevity of the Seagate drives with the WD drives. I've had good luck with WD up until about a year ago. Now, their drives do not seem to be of the quality that they once were. I get a lot of errors on some WD drives sooner than expected. Hopefully these Seagate drives fair better. Anyhow, so far so good. -------------------------------------------- UPDATE 15AUG2025 -------------------------------------------- So, a 4TB WD RED PLUS drive in my server went bad. The drive is 4 month old. It started about a week ago with some Sector Reallocation errors, then more errors over the days... then hundreds of bad sectors. I couldn't write data to the drive anymore, then the server kicked out the drive and refuses to start it up. I pulled the drive and tested on my PC... yeah, the drive is going bad, and it is going bad fast. I formatted it, put it back in the server (to trick the server into thinking it was a new drive), it rebuilt the data (after about 10 hours or so), and all seemed fine. But, soon after (within hours), it started acting up again. Definitely a bad drive. I can read data from it, but writing to it is challenging as it triggers a cascade of sector errors. Had to call WD today and RMA the drive... now I have to pack it up and ship it at my expense to get a replacement. Honestly, it's probably not worth it. I do not want another new WD drive in my server. I'll probably put in on light duty on one of the kids PCs or something instead. WD's quality has fallen into the toilet, and this new drive I will get from them will probably be another bomb waiting to happen. You know sticking in a new replacement into the server and waiting 10 to 12 hours for the data to rebuild is not particularly fun. WD I am not impressed in the slightest. This is particularly bad since this was a BRAND NEW RED PLUS drive. I not long ago replaced another WD drive with a Seagate. A brand new WD Red Plus..... and sitting next to it is a 5 year old WD Blue purring away happily without complaint... WOW! What happened to WD?!?!?! I have a 7 year old WD Green (they don't even make them anymore) that still works fine... and a new RED Plus can't make it past 4 months. Amazing. I even have a WD Blue that is years and years old in my security camera DRV/NVR recording 24/7... never has an issue...WD used to make good product. They are garbage now in my opinion. So, guess what I ordered as a replacement for the RED PLUS? Yep, I ordered a Seagate Ironwolf... even though WD is giving me a replacement (which you have to wait weeks and weeks for), I am paying for another Seagate to replace it with. The Red Plus will never see the inside of my server as I do not need the aggravation. It might be a long long long time before I ever order another WD drive again. Not until they sort out their quality again. My advice is to stay away from WD drives.... it is hit and miss with them. It is like playing Russian roulette with your data. So, we are down to two players left in the HDD world; Seagate and Toshiba. But, for now I am happy with Seagate. -------------------------------------------- UPDATE 06OCT2025 -------------------------------------------- I did finally receive the replacement WD RED Drive. WD sent me a white label drive instead of a RED label drive. It's basically the same drive but it has a label that looks like some printed on a thermal printer type label that they must issue when doing replacements or something. I didn't put it in my server. Instead, I have replaced 4 drives in my server with Seagate drives now. I even replaced my parity drive with a Seagate at this point, since it was a WD and started giving SMART warnings as well. So, the UNRAID server is almost entirely Seagate drives now and everything is running happy and smooth. The LSA HBA card has no issues with these drives at all and UNRAID sees them as normal SATA drives (normal as if they were connected to the motherboard directly)... just in case there are any UNRAIDers out there considering a LSA HBA card... I used a 9300 16i that was already in IT mode... zero issue with it with UNRAID... plug and play literally, the drivers come up automatically during boot. Anyway, the Seagate drives have been awesome so far. -------------------------------------------- UPDATE 01AUG2026 -------------------------------------------- The Seagate drives are still purring away happily. No issues at all. No errors, no SMART warnings, no data issues. Exactly how you want your drives to work. My only complaint these days is price, but, to be fair that is every manufacturer now so I am not singling Seagate out for this. I would buy more drives but I can't justify it at these price levels. Even if I had a failure and needed a replacement I would seriously consider migrating parity data (backing up from parity) to the existing remaining array and just live with one less drive on the server for now. If my parity drive failed, I would move data off a drive to other drives and move that drive to parity and rebuild the parity. This is a super time consuming process but at these prices I have the time. The 4TB Ironwolf should be around $89 to $100 max. At $200 (including tax) this is twice the price for the same storage. This is a 100% increase in price in just over half a year or so. The higher capacity drives are just not even in reach for most hobbyists or people. And if you run a server you need to upgrade at least two drives when you want to go up to a larger size (UNRAID requires a parity drive the same or larger than your largest drive in your storage array (or pools), other servers depending an RAID structure might require you upgrade all drives (in a pool) to the same size including any parity or backup). 4TB is not a lot of storage by today's standards and I know I can fill it up pretty fast. I mean at these levels I might have to break out my spindle of rewritable Blu-ray discs for backup. Yes, I still have optical drives. I've already started using DVD-RW's again for small things. The costs of HDD/SDD/DRAM/GPU is insane. It is starting to make more sense, again, to buy cheap DVD and Blu-Ray movies to keep them on optical to avoid using HDD storage. Garage sales are my best friend these days, especially if I can find a not too old PC for cheap and cannibalize drives (and maybe other parts) for less than buying them online. I have 3 computers, 1 server, and a security system in my home network. ZERO hdd/sdd/dram/gpu or flash drive upgrades going on these days. Hopefully things change in the future. Fingers crossed. But the Seagate drives I did install, when they were affordable, are working great. So, if you really really really need a drive and can't wait and are willing to spend crazy money, consider carefully. At these prices drive selection is a critical decision now. Throwing away $200+ dollars is no small thing, and at high capacities you are getting up there in the $350, $500+ range. Choose wisely.