Exos X16: Every Part Number From 10 TB to 16 TB, and How It Differs From X18 and X24
Prices checked: · Published: · Price tracking since 5 November 2026
Quick answer
Exos X16 is Seagate's 10 TB to 16 TB generation, in SATA or SAS, with standard, SED and SED-FIPS options. ST16000NM001G is the standard 16 TB SATA model. Its sheet lists 261 MB/s at 16 TB and 256 MB of cache. Match your exact number to the grid below, then check the Amazon.co.uk rows.
Exos X16 part numbers at 16TB, 14TB, 12TB and 10TB
Seagate's Exos X16 sheet, DS2011.2-1910US, dates from October 2019 and prints eight capacity and interface columns across two pages. The grid below copies every part number from them, one row per capacity and encryption option. Where the sheet shows a dash, the cell says Not listed.
| Feature | SATA 6Gb/s | SAS 12Gb/s |
|---|---|---|
| 16 TB standard | ST16000NM001G | ST16000NM002G |
| 16 TB SED | ST16000NM003G | ST16000NM004G |
| 16 TB SED-FIPS | Not listed | ST16000NM009G |
| 14 TB standard | ST14000NM001G | ST14000NM002G |
| 14 TB SED | ST14000NM003G | ST14000NM004G |
| 14 TB SED-FIPS | Not listed | ST14000NM012G |
| 12 TB standard | ST12000NM001G | ST12000NM002G |
| 12 TB SED | ST12000NM003G | ST12000NM004G |
| 12 TB SED-FIPS | Not listed | ST12000NM008G |
| 10 TB standard | ST10000NM001G | ST10000NM002G |
| 10 TB SED | ST10000NM003G | ST10000NM004G |
| 10 TB SED-FIPS | Not listed | ST10000NM010G |
Every SED-FIPS number sits on the SAS side. No SATA column carries one at any of the four capacities, so a requirement for that option on an X16 means a SAS drive.
The FIPS endings also refuse to line up: 009G at 16 TB, 012G at 14 TB, 008G at 12 TB and 010G at 10 TB. This page offers no decode of those digits, because none of the documents we hold explains them. Copy the whole number and leave the pattern alone.
Exos X16 ST16000NM001G: the standard 16TB SATA model
ST16000NM001G heads the first column of the sheet: 16 TB, SATA 6Gb/s, standard FastFormat. That makes it the plain model at this size, not a self-encrypting one. ST16000NM003G is its SED counterpart and ST16000NM002G the SAS equivalent, one digit away and easy to mistype on an order.
Its column lists a single port, 512 bytes per sector in 512e, 256 MB of multisegmented cache, 261 MB/s (249 MiB/s) maximum sustained transfer and 2,500,000 hours MTBF. Average idle is 5.00 W, maximum operating power under random 4K/16Q work is 10.0 W reading and 6.3 W writing, and the drive weighs 670 g. All of that is Seagate's rating; none of it is our measurement.
FastFormat models ship in the 512e state. Seagate warns that running the FastFormat routine to switch from 512e to 4Kn deletes all data on the drive, so settle the sector format while the drive is still empty.
Exos X16 14TB, 12TB and 10TB: where the sheet's columns change
From 16 TB to 14 TB, nothing in the table below moves. Both sizes share 261 MB/s, the same power figures and the same weight. The first real step comes at 12 TB on SATA, where the sheet drops to 245 MB/s (233 MiB/s) and to 9.5 W and 6.0 W under random work. Weight does not fall with it: the 12 TB SATA model is also 670 g.
| Feature | 16 TB and 14 TB SATA | 12 TB SATA |
|---|---|---|
| Max sustained transfer (outer diameter) | 261 MB/s (249 MiB/s) | 245 MB/s (233 MiB/s) |
| Average idle A | 5.00 W | 5.0 W |
| Max operating, random read and write 4K/16Q | 10.0 W, 6.3 W | 9.5 W, 6.0 W |
| Random read/write 4K QD16 WCD | 170/440 IOPS | 170/440 IOPS |
| Multisegmented cache | 256 MB | 256 MB |
| MTBF | 2,500,000 hours | 2,500,000 hours |
| Weight | 670 g (1.477 lb) | 670 g (1.477 lb) |
At 16 TB and 14 TB the interface changes the column more than the capacity does. SAS models are dual-port where SATA models are single-port, and they list 512, 520 and 528 bytes per sector in 512e. Under random work the SAS columns are rated at 10.2 W and 6.2 W, against 10.0 W and 6.3 W on SATA.
Below that the sheet settles. On these rows 10 TB matches 12 TB interface by interface, so dropping to the smallest X16 buys no lower power figure. SAS eases only once, from 10.2 W at the larger sizes to 10.0 W here, with the write figure unchanged at 6.2 W.
| Feature | 12 TB and 10 TB SATA | 12 TB and 10 TB SAS |
|---|---|---|
| Max sustained transfer | 245 MB/s (233 MiB/s) | 245 MB/s (233 MiB/s) |
| Average idle A | 5.0 W | 5.00 W at 12 TB, 5.0 W at 10 TB |
| Max operating, random read and write 4K/16Q | 9.5 W, 6.0 W | 10.0 W, 6.2 W |
| Interface ports | Single | Dual |
| Weight | 670 g (1.477 lb) | 670 g (1.477 lb) |
Exos X16 vs X18: the same 16TB, a different drive on paper
Both generations list 16 TB, so the sheets can be set side by side at one size. The X18 sheet followed in February 2021 and tops out at 18 TB.
| Feature | Exos X16 | Exos X18 |
|---|---|---|
| Largest capacity on the sheet | 16 TB | 18 TB |
| 16 TB SATA, standard | ST16000NM001G | ST16000NM000J |
| 16 TB SAS, standard | ST16000NM002G | ST16000NM004J |
| Max sustained transfer, 16 TB | 261 MB/s (249 MiB/s) | 270 MB/s (258 MiB/s) |
| Max operating, 16 TB SATA | 10.0 W, 6.3 W | 9.4 W, 6.4 W |
| Max operating, 16 TB SAS | 10.2 W, 6.2 W | 9.6 W, 6.7 W |
| Weight, 16 TB | 670 g | 670 g |
At 16 TB the later sheet adds 9 MB/s of sustained transfer and trims the random read figure by 0.6 W on both interfaces, while the random write figure goes up slightly: 0.1 W on SATA and 0.5 W on SAS. Weight is unchanged. None of that comes from a test of ours; it is one Seagate document set against another.
Recording technology is where the two documents differ in kind. The X18 sheet has a row reading Conventional Magnetic Recording (CMR), Yes. We have not found a recording-technology line in the X16 sheet text we hold. A Recording cell in the table prints only where we hold a document naming that part number. The full grid for the later generation is on Exos X18.
Exos X16 vs X24: 16TB and 12TB under new numbers
The X24 sheet returns to two X16 capacities, 16 TB and 12 TB, alongside 24 TB and 20 TB. The part numbers change and so does one interface reading that is easy to get wrong.
| Feature | Exos X16 | Exos X24 |
|---|---|---|
| 16 TB SATA, standard | ST16000NM001G | ST16000NM002H |
| 16 TB SAS, standard | ST16000NM002G | ST16000NM007H |
| 12 TB SATA, standard | ST12000NM001G | ST12000NM002H |
| Max sustained transfer, 16 TB | 261 MB/s (249 MiB/s) | 285 MB/s (272 MiB/s) |
| Multisegmented cache | 256 MB | 512 MB |
| Weight | 670 g | 685 g |
ST16000NM002G and ST16000NM002H differ by one final letter, yet the sheets print the first as X16 SAS and the second as X24 SATA. Check the last character before you order.
At 16 TB the X24 sheet doubles the cache and lists 24 MB/s more sustained transfer than the X16 sheet, and the drive is 15 g heavier. For one capacity across every generation, the better starting point is Seagate Exos 16TB. The Exos X24 page carries that generation's own grid, and Seagate Exos covers the range as a whole.
What the Exos X16 datasheet promises, and what it leaves open
The sheet's first page carries the line 'Industry's first 16TB drive for 33% more petabytes per rack', and footnote 1 gives the baseline: 'Compared to 12TB competitive product'. Take that as a claim from October 2019. The X18 and X24 sheets list 18 TB and 24 TB drives, so it is history and not a ranking of the range as it stands.
The same sheet speaks of a 5-year limited warranty alongside the 2.5M-hour MTBF rating. That is Seagate's statement about the product. It says nothing about a particular seller or a used unit, and we make no claim that it carries over to one. A row marked used in our table is not proof of a factory-recertified drive either, so ask the seller what stands behind it before relying on it.
The page on refurbished enterprise hard drives deals with the split between a maker's warranty and statutory rights.
Exos X16 on Amazon.co.uk: live listings in pounds inc VAT
The Exos X16 table below holds 4 listings, in pounds inc VAT, with each row's condition shown. Each title is the seller's wording, so hold its part number against the grid at the top of this page.
Seagate Exos X16 on Amazon.co.uk
Product | Part number | Capacity | Interface | Recording | £/TB inc VAT | Condition | Price (inc VAT) | Buy on Amazon |
|---|---|---|---|---|---|---|---|---|
| Seagate Exos X16 16 TB | ST16000NM001G | 16 TB | SATA | not sourced | £34.69/TB | UsedSeller: Componix Global | £555.00 | £555.00Buy on Amazon |
| Seagate Enterprise Exos X16 3.5" 10000GB SAS | ST10000NM002G | 10 TB | SAS | not sourced | £36.67/TB | NewSeller: Miragetek IT Store | £366.65 | £366.65Buy on Amazon |
| Seagate 16TB ST16000NM001G Exos X16 SATA 7.2K RPM 512e/4Kn 256Mb | ST16000NM001G | 16 TB | SATA | not sourced | £37.19/TB | NewSeller: Componix Global | £595.00 | £595.00Buy on Amazon |
| Seagate Enterprise Exos X16 3.5" 12000 GB Serial ATA III | ST12000NM001G | 12 TB | SATA | not sourced | £43.75/TB | NewSeller: The Full-Cart | £525.00 | £525.00Buy on Amazon |
n/s = we could not read that value from the listing. Prices are in pounds sterling and include VAT.
The sort is per TB and puts every size in one list, so compare drives of the same capacity and interface. The filter behind this table removes two known mismatches: a drive sold under the X16 name at a capacity the sheet omits, and a part number absent from the sheet. Others could still slip through.
Before picking a column, confirm whether your backplane and controller take SATA or SAS. The sheet settles what each drive is, not what your chassis accepts, and SAS vs SATA weighs up that choice.
Frequently asked questions
Does the Exos X16 come in 10TB?
Yes. The sheet's third page lists ST10000NM001G on SATA and ST10000NM002G on SAS as the standard models, with ST10000NM003G and ST10000NM004G as the SED versions. ST10000NM010G is the only 10 TB SED-FIPS model.
Which Exos X16 12TB model is self-encrypting?
ST12000NM003G on SATA and ST12000NM004G on SAS. The 12 TB SED-FIPS number, ST12000NM008G, is printed for SAS only.
Is the Exos X16 16TB the same drive as the Exos X18 16TB?
No. They carry different part numbers on separate sheets: ST16000NM001G against ST16000NM000J on SATA. The X18 sheet also lists a higher sustained transfer rate at this capacity.
Is the Exos X16 14TB SATA or SAS?
The sheet lists both: ST14000NM001G is the standard SATA model and ST14000NM002G the standard SAS model. If an Amazon title gives a different interface for one of those numbers, we go by the sheet.
Sources
- Seagate: Exos X16 data sheet, DS2011.2-1910US, accessed 5 November 2026
- Seagate: Exos X18 data sheet, DS2045.3-2102US, accessed 5 November 2026
- Seagate: Exos X24 data sheet, DS2080-2307US, accessed 5 November 2026