Seagate IronWolf Pro, 20 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST20000NT001)
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Availability:
Only 2 left in stock, order soon!
Arrives
Feb 3 – Mar 14
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Style: IronWolf Pro
Capacity: 20TB
Color: NAS PRO
Features
- High Performance: All-CMR (conventional magnetic recording) portfolio enables consistent, industry-leading 247 performance allowing users to access data anytime, anywhere.Average Operating Power (W) - 7.7W, Operating Temperature (drive reported, max C) : 65, Operating Temperature (ambient, min C) : 0
- Class-Leading Dependability: Up to 550TB/year workload rating, 2.5M hours MTBF, and 5-year limited warranty for unparalleled total cost of ownership (TCO)
- Peace of Mind with Data Recovery: Complimentary 3 year Rescue Data Recovery Services for a hassle-free, zero-cost data recovery experience
- IronWolf Health Management: Helps protect data with prevention, intervention, and recovery recommendations to ensure peak system health
- Optimized for NAS: AgileArray with dual-plane balancing, time-limited error recovery (TLER), and rotational vibration (RV) sensors to deliver top RAID performance in multi-bay environments
- The available storage capacity may vary.
- Please note: This drive is designed specifically for NAS systems and may require specific setup and compatible hardware. Always test in a compatible NAS or RAID environment.
Description
IronWolf® Pro drives are engineered to deliver 24×7 performance, reliability, and dependability in multi-bay, multi-user commercial and enterprise RAID storage solutions. Built tough with conventional magnetic recording (CMR) technology, rotational vibration sensors, and AgileArray™ firmware for consistent, best-in-class performance and total cost of ownership (TCO). Peace of mind with five-year limited warranty, complimentary three-year Rescue Data Recovery Services, and IronWolf Health Management.
Digital Storage Capacity: 20 TB
Hard Disk Interface: SATA 6 GB/s
Connectivity Technology: SATA
Brand: Seagate
Special Feature: Portable
Hard Disk Form Factor: 3.5 Inches
Hard Disk Description: Mechanical Hard Disk
Compatible Devices: Desktop
Installation Type: Internal Hard Drive
Color: NAS PRO
Hard Drive: 20 TB Mechanical Hard Disk
Brand: Seagate
Series: ST20000NT001
Item model number: ST20000NT001
Item Weight: 1.52 pounds
Product Dimensions: 5.79 x 4.01 x 1.03 inches
Item Dimensions LxWxH: 5.79 x 4.01 x 1.03 inches
Color: NAS PRO
Computer Memory Type: DIMM
Hard Drive Interface: SATA 6 GB/s
Hard Drive Rotational Speed: 7200 RPM
Manufacturer: Seagate
Language: English
Is Discontinued By Manufacturer: No
Date First Available: August 22, 2022
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Feb 3 – Mar 14
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: IronWolf
Capacity: 4TB
Color: NAS
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.
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Reviewed in the United States on June 2, 2025 by Amazon Customer for a really long time
Style: IronWolf
Capacity: 12TB
Color: NAS
My in laws recently had to move into a new warehouse. After getting quotes up the yin yang to install security cameras in the facility (everything also tacked on monthly "cloud" subscription costs) we decided to go the DIY route. We ended up with Reolink's 32 channel capable system and hooked up 24 of the 32 channels. The 32 channel system comes with NO hardrive so you buy what fits your needs... Enter this hard drive. Installation is easy just mount and hook in the power and sata cables. The NVR had no issues formatting then writing onto the drive. Playback had no issues and all 24 channels records at the max 4k res and capturing everything important in the facility. Great bang per gig buck along with being a NAS drive - it should go on for many years. Solid drive - easy and straight forward - works in the NVR capturing 24 ip streams - love it! Going the DIY route btw did save us over 15K and got better equipment to boot!
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Reviewed in the United States on December 10, 2025 by PiyoPiyo
Style: IronWolf
Capacity: 8TB
Color: NAS
The media could not be loaded. Picked up two Seagate IronWolf 8TB drives to run in my Synology DS224+ NAS, and I’ve got to say: these things are whisper quiet. I had them transferring media for about 15 hours straight, and they barely made a sound the whole time. Write speeds are great too! Fast, steady, and no hiccups so far. I almost went for the IronWolf Pro versions, but for about $20 more per drive, the only real difference was around 60 MB/s faster write speeds, which didn’t seem worth it for my setup. These standard IronWolfs are handling everything I’ve thrown at them without breaking a sweat. We’ll see how they’re holding up in six months, but so far, I’m really happy with the purchase. Quiet, cool, and reliable, exactly what I needed for my media NAS.
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Reviewed in the United States on October 25, 2025 by TC TC
Style: IronWolf
Capacity: 4TB
Color: 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!
Reviewed in the United States on November 5, 2025 by Dean