Seagate IronWolf Pro, 12 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST12000NT001)

Good drive, good price (when on sale).
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.

Rock-Solid Performance for My NAS
I bought these Seagate IronWolf 4TB drives for my UGREEN 6 bay NAS, and they’ve been absolutely bulletproof. Not a single issue since installing them – quiet, reliable, and consistent performance every day.Perfect drives for NAS use – set and forget reliability. Highly recommended!

Terrible Customer Support
The drives themselves are great — when they work, but when they don’t you’ll have to deal with a terrible, extended customer support situation.I have purchased 4 of these drives so far, and one has had issues since I received it. It started out causing random freezes in my RAID array, mount failures on startup, extended delays on shutdown, etc. After a few months, I was finally able to determine this was all caused by a hardware issue, and which drive was the problem because SMART started throwing out warnings about bad sectors. This is further confirmed, because after removing the drive the array functions without any issues.I started a warranty replacement with Seagate about a month ago now. To start, you have to pay return shipping when they send you a faulty drive. That’s annoying, but not a dealbreaker. The drive is delivered and USPS/tracking confirms its delivery. After a few days, Seagate still shows nothing on my case number. I contact support, they say they require 10 business days after delivery before they will update your case status to being received. After 14 business days of no response, I contacted support again. They then say they never received the drive (AKA, Seagate lost it), and tell me to contact USPS to get a “Tracer”. I contact support again after receiving the tracer, they say they’ll escalate the ticket and have the warehouse look for it (you didn’t do that already?!).I’m still waiting on a replacement drive, if I ever will get one. Supposedly, if they look for the drive they lost, and don’t find it, they’ll send a replacement drive. I don’t see how any of this is my fault or problem though, and it’s absurd that I still don’t have the working drive that I paid for, but they refuse to send a replacement until they complete this search they should have done weeks ago.UPDATE: I have contacted support twice since this review, they never found the drive, they never sent a replacement. They also never contacted me at any point in this process. I have always had to wait and contact them again, even when a rep would confirm my email address and directly say they would email me. Supposedly, after this most recent conversation they are just sending a replacement. I’m not going to hold my breath, but maybe after over a month of this they’re going to actually send a replacement.I also confirmed with support, that the other reviews are correct. They will only ever send a refurbished drive — even though in my case I never received the new, working drive I ordered. It has been stuttering and causing freezes ever since I purchased it, I just couldn’t figure out which drive was the problem before the return window. They also claim they will send the same model, so fingers crossed that’s true (unlike what other reviews have state here). I have my doubts though.I’ll never buy Seagate again.UPDATE #2: The saga continues. My ticket was marked as “completely processed” and I was never sent a replacement. I confirmed with support that they also don’t have a tracking number. Only time will tell if I ever get the USED drive I paid full price + extra shipping + many hours for.UPDATE #3: I finally got a replacement drive. Surprise! It’s completely DOA. It doesn’t spin up, it just beeps (indicating internal component failure). Starting all over with this whole process (almost a year after placing the original order). At least they provided a pre-paid shipping label to send back the dead replacement drive they sent me….UPDATE #4: I did finally get a hard drive that worked… but a couple months later a different drive (I have 4, all ordered about a year ago) started failing. Bad sectors, completely unreadable, could not be allocated. This would mean data loss/corrupted files, if this drive was not in a RAID array with redundancy. At this point it is almost comical how unreliable these drives are. DO NOT buy these!UPDATE #5: Another dead-on-arrival replacement “certified rerfurbished” drive. Doesn’t spin, just beeps. Tried it in my NAS, desktop, and an enclosure. The drive is completely non-functional. This company is a joke.

Bought two of these 4TB IronWolf drives for my new DS223j. They were recognized immediately, installation was effortless, and they’ve been running quietly and reliably 24/7. Great drives for a home NAS setup

I bought 4 of these, 3 were working and 1 spoilt.. i almost returned it but found out i could send to Seagate for RMA to get a replacement.. so i did that as i bought it at a super price.. returning it would mean i’d have to buy another at a much higher price. Overall still happy since i can get a new one from Seagate as they have international warranty.Update 18May’25:i sent in the 12TB to Seagate for RMA, and they sent me a replacement 18TB.. how awesome is that.. 🙂