ST20000NM007D: Seagate Exos X20 20TB 7200 RPM SATA 6Gb/s 512e/4Kn 3.5-Inch Enterprise Hard Drive
Also listed as: 2R2103-002, Exos X20 20TB SATA, 2R2103-001 · made by Seagate
The Seagate Exos X20 20TB (model ST20000NM007D) provides 20TB of Conventional Magnetic Recording capacity in a proven 10-disk helium platform. Reaching up to 285 MB/s sustained throughput, it is widely installed in hyperscale cloud environments and high-capacity backup appliances. When buying used 20TB enterprise hard drives, verify SMART attribute 5 and 197 for clean zero counts, check that the helium pressure sensor reports pass, and verify drive sled rail alignment.
Specifications
| Part number | ST20000NM007D |
|---|---|
| Brand | Seagate |
| Made by | Seagate |
| Type | Hard drives |
| Other numbers | 2R2103-002, Exos X20 20TB SATA, 2R2103-001 |
| Status | current |
| Capacity (GB) | 20,000 |
| Interface | SATA 6Gb/s |
| Form factor | LFF 3.5in |
| Speed | 7200 rpm |
| Cache (GB) | 0.256 |
| Generation fit | Universal 3.5-inch enterprise server and storage drive bays |
About the ST20000NM007D
ST20000NM007D is Seagate's 20TB 7200 RPM SATA 6Gb/s enterprise hard drive in the Exos X20 series. Utilizing a 10-disk helium platform with Conventional Magnetic Recording (CMR), it delivers sustained data rates up to 285 MB/s with a 2.5 million hour MTBF rating. It is designed for hyperscale cloud data centers, scale-out NAS enclosures, and massive backup repositories requiring maximum petabyte density.
Compatibility
Fits standard 3.5-inch large-form-factor server drive bays across modern enterprise server platforms from Dell, Lenovo, HPE, and Supermicro. Requires a SATA 6Gb/s compatible controller or SAS/SATA HBA. Ensure host storage controller firmware is updated to support 20TB capacity addressing.
How to identify a genuine unit
The label features Seagate Exos X20 branding with model ST20000NM007D, part number 2R2103-002, and 20TB capacity notation. In system management software, the drive identifies as ST20000NM007D. OEM variants (such as Dell 400-BOER) feature Dell firmware prefixes.
Buying used
Inspect SMART health for raw read error rate, reallocated sector count, and helium seal pressure status. Verify that the drive was not decommissioned from a locked proprietary SAN enclosure. Confirm that mounting screw holes on the 3.5-inch aluminum casting are undamaged.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 365 (1 sighting, Oct 2026)
Used: USD 235 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 365 | 2026-10-27 | |
| ebay.com | used | USD 235 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Dell 400-BOER Dell 20TB 7.2K SATA 3.5in Exos X20 HDD
FAQ
What is the cache size of Exos X20?
256MB multisegmented cache.
Does Exos X20 use SMR?
No, it is a CMR (Conventional Magnetic Recording) hard drive.
What is the sustained transfer rate?
Up to 285 MB/s.
Buying or selling ST20000NM007D?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Seagate Exos X20 Product Manual, checked 2026-10-27