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Seagate

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: 11 left in stock
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Arrives Monday, Sep 21
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Style: IronWolf Pro


Capacity: 20TB


Color: Black


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: Black


Digital Storage Capacity: 20 TB


Hard Disk Interface: SATA 6 GB/s


Connectivity Technology: SATA


Additional Features: Portable


Hard Disk Form Factor: 3.5 inches


Compatible Devices: Desktop


Hard Disk Rotational Speed: 7200 rpm


Specific Uses For Product: Business


Read Speed: 180 megabytes_per_second


Cache Memory Installed Size: 256


Data Transfer Rate: 5000 megabytes_per_second


Form Factor: 3.5-inch


Hardware Connectivity: SATA 6.0 Gb/s


Hardware Platform: PC


Hard-Drive Size: 20 TB


Item Weight: 690 g


Item Dimensions L x W x Thickness: 5.79"L x 4.01"W x 1.03"Th


Number of Items: 1


Unit Count: 1 Count


Customer Package Type: Frustration-free packaging


Brand: Seagate


Model Number: ST20000NTZ01


Hard Disk Description: Mechanical Hard Disk


Built-In Media: IronWolf™ Pro 20TB SATA


Model Name: ST20000NT001


Manufacturer: Seagate


Global Trade Identification Number: 76, 32, ,


UPC: 763649176252 763649177068


Item Type Name: IronWolf Pro Refresh


Mfr Part Number: ST20000NT001


Warranty Description: 5-Year-Manufacturer


Installation Type: Internal Hard Drive


EU Spare Part Availability Duration: 5 years


Color: Black


Enclosure Material: Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 21

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.

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Top Amazon Reviews

    • Very happy customer!
Style: IronWolf Pro Capacity: 20TB Color: Black
Shipped and delivered as promised and the Seagate Ironwolf 20TB drive (OEM version) is working flawlessly.
Reviewed in the United States on August 31, 2026 by Jim Haggerty
    • Runs Hot - high DOA rate - price increase instead of decrease 20mo later?
Style: IronWolf Pro Capacity: 20TB Color: Black
These 20TB drives are slowly replacing my 10TB HGST Drives in my RAID-6 configuration. 1st drive went without a hitch. 2nd drive also good (server is hot-swappable w/auto RAID rebuild; super simple replacement). 3rd drive could NOT be recognized. Sent back as DOA. Installed the replacement w/o an issue. Noticing at this point that ALL these drives run close to 105-106 deg. 4-6 deg hotter on average than the 10TB HGST drives. Hopefully this won't become an issue? Will be installing the last drive this week (4th drive of five). Will update after system reconfiguration to take advantage of the capacity doubling. Update: 4th Drive is also bad. Sent back DOA. If the DOA replacement (for the 2nd time) is good, that'll mean two of six drives were bad. 33.3% DOA rate... How do you feel about that? Keep in mind that these are NAS drives, usually in a large RAID array, so everytime one is replaced/upgraded the RAID must rebuild. A large RAID means a long rebuild time. And if the drive is bad, you have to put the old one back in (in case of an upgrade) and the array has to rebuild anyway. Whats worse, if you're NOT upgrading, but instead repairing, now you've got a degraded array for a few more days with doubts that the replacement drive will work? This situation sucks. Regarding my earlier comments regarding running hotter - these 20TB drives, after examining the label, consume just over 50% more power than the 10TB HGST's that are being removed/upgraded. This choice may have been a grave mistake. Thank God I initially setup a RAID 6 as opposed to a RAID 5 or I'd be on pins and needles. Remember, these drive are data rated for how much data they can read/write in thier lifetime. This rating, if even accurate, is getting chewed up every time there's an array rebuild (including the rating on the existing working drives in the array). Unhappy situation. Perhaps Western Digital was the better choice? EDIT 7/25/2023: Yup, 6th drive worked. All four drives have now been replaced/upgraded. Two of six were DOA. That seems ridiculous to me. RAID has rebuilt 100% and now is under expansion to take advantage of the capacity doubling (these drives are 2x capacity of the drives they replaced), another 53hrs. I'd be done by now if it weren't for the DOA drives. Now I have to live with the constant worry of possible pre-mature failure. I mean, based on the increased heat and the DOA rate, what would you think? EDIT 3/20/2025: The 4 of 6 drives that worked are still working 20mo later. They are still selling these exact drives, but now for 15% more 20mo later? ... show more
Reviewed in the United States on July 19, 2023 by Mike Abretske
    • What went Wrong?
Style: IronWolf Pro Capacity: 20TB Color: Black
Returned - Day one after delivery after proving it never worked - Refund delayed with No reason - Amazon AI response suggests not to worry. This note to “not worry“ was repeated several times, as additional Refund delays occured. NO REFUND yet. I’m starting to worry Refund honored - ordered a replacement and DELIVERED we are good to go all five racked and status shows we are good to go. 100tb online. ... show more
Reviewed in the United States on June 29, 2026 by Dan Vicary
    • 2 Working right out of the box. This is an important investment I'm happy to have made.
Style: IronWolf Pro Capacity: 20TB Color: Black
Nice of them to give me 22TB instead of paying for 20 TB. I bought 2 for a mirrored raid. Damn expensive for me, but now I don't dread a failed drive. It happened to me before, so this is a big deal.
Reviewed in the United States on May 6, 2026 by WillChill
    • Must-buy products
Style: IronWolf Pro Capacity: 20TB Color: Black
I received the hard drive damaged at first. After reaching out to customer service, they promptly sent a replacement. This time everything was fine — the drive performs excellently, runs quietly, and has ample capacity. Overall, I’m quite satisfied.
Reviewed in the United States on May 25, 2026 by OLIVER
    • Horrible customer support
Style: IronWolf Pro Capacity: 20TB Color: Black
I purchased 8 of these drives and within 3 months, one was reporting bad sector errors, which is an indicator of a cascading failure. Under warranty and the agreement of a customer service rep doing my RMA, they would send me a replacement unit once they received my faulty unit. I waited a month after my drive was sent to them and I heard nothing back. I contacted another of their representatives and told me they would not send me a replacement because it was flagged with "dents/scratches/damages". I have now been "escalated" to a follow up team where I will now have to wait for an email from them and I'll most likely have to argue and ask why they are trying to not honor their warranty and give me this roundabout way of telling me to go away. This way of treating your customers who have paid over a thousand dollars for your product is awful. I do not think I will do business with Seagate again and I do not recommend that anyone does either. ... show more
Reviewed in the United States on February 19, 2026 by Jerry Murillo-Jamaica
    • Solid drive at a fair price.
Style: IronWolf Pro Capacity: 20TB Color: Black
I've used Seagate IronWolf drives for NAS storage for years and have always had good results. This is no exception. The 20TB capacity is great and I was able to purchase this one at a very fair price. These platter drives are considerably less expensive than solid-state drives with comparable capacity, but also a fair bit slower and noisier. The noise isn't really objectionable, but you can definitely hear them ticking and grunting from several feet away. The sound is about as loud as moderate rain falling on the roof. SSDs would be very nice but would cost a whole lot more. For simple file storage and retrieval, these are more than sufficient. If I were running programs from the drive (like data-intensive games or video editing) these drives might not be ideal but for storing video files or other data, they work great. ... show more
Reviewed in the United States on May 20, 2024 by Robert F. DeVellis
    • 5 drives performing great with 1 DOA
Style: IronWolf Pro Capacity: 20TB Color: Black
I originally purchased 4 of the 20 TB IronWolf Pro drives for my NAS. They are all working and performing as expected. I purchased 2 more to fill the empty bays in my NAS. unfortunately, one of them was DOA making clicking sounds and not recognized by the OS. I returned the DOA drive, but was not offered a replacement, only a refund. Usually that's not a big deal, but the price of a replacement increased by $70. I ordered a new drive that I am still waiting to receive. I spoke ti an Amazon customer service representative who stated they could refund the price difference to me after they process the return. I'll update this review with the final outcome. ... show more
Reviewed in the United States on April 29, 2026 by Brian

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