Used
$23.22/TB
18TBSATA
Seagate Exos X18 ST18000NM000J 18TB 7.2K 6G SATA 3.5" HDD (Used, Tested)
Seagate
from$417.96
In stockSeagateSATA18TB3.5 in
Seagate Exos X18 18TB SATA (ST18000NM000J)Specs, test results and price
18 in stock from $417.96 · 28 units tested in-house
In stock now (1)
About the ST18000NM000J
The Seagate Exos X18 (ST18000NM000J) is an 18TB SATA hard drive built on a 3.5 inch form factor, intended for servers and storage systems that need large single-drive capacity with a SATA 6Gb/s interface. This listing covers the units of that exact part number that this store has tested and has in stock.
All 28 units in this batch passed a full test pass, which includes a sequential and random read/write benchmark, a full extended self-test across the entire surface, a cross-check of reported power-on hours against an independent on-drive log, a NIST 800-88 sanitize with read-back verification, and a SMART health read covering reallocated, pending, and uncorrectable sectors. Measured sequential throughput across the batch sits at a median of about 275 MB/s read and 276 MB/s write.
Power-on hours across the 28 drives range from about 10,000 to 36,500, with a median near 25,500 hours. Based on recorded hours, units are grouped into Light Use (500 to 20,000 hours, 10 units) and Standard Use (20,000 to 40,000 hours, 18 units), so buyers can choose a tier that matches their tolerance for prior runtime.
Specifications
| Brand | Seagate |
|---|---|
| Part number | ST18000NM000J |
| Type | Hard drive |
| Capacity | 18TB |
| Interface | SATA 6Gb/s |
| Form factor | 3.5 in |
Tested units
- Units tested
- 28
- Pass rate
- 100% (28 of 28)
- Units sold
- 10
- Power-on hours, median
- 25,568 h
- Power-on hours, range
- 10,033 to 36,505 h
- First tested
- Aug 25, 2026
- Last tested
- Oct 3, 2026
- Sequential read, median
- 275 MB/s
- Sequential write, median
- 276 MB/s
Every unit of this model we have handled, from our test database. What we test
Hours distribution
- Light Use under 20,000 hrs10 units · 36%
- Standard Use 20,000-40,000 hrs18 units · 64%
Units by usage tier, from their SMART power-on hours. How tiers work
Recent unit reports
Every unit we sell gets a permanent public report. Serial and seal numbers stay on the certificate in the box.
| Unit | Tier | Power-on hours | Tested | Result | Report |
|---|---|---|---|---|---|
| U-300 | Light Use | 10,405 | Oct 3, 2026 | Pass | View report for unit U-300 |
| U-299 | Light Use | 10,033 | Oct 3, 2026 | Pass | View report for unit U-299 |
| U-298 | Light Use | 10,112 | Oct 3, 2026 | Pass | View report for unit U-298 |
| U-297 | Light Use | 10,075 | Oct 3, 2026 | Pass | View report for unit U-297 |
| U-296 | Light Use | 10,455 | Oct 3, 2026 | Pass | View report for unit U-296 |
| U-295 | Light Use | 10,034 | Oct 3, 2026 | Pass | View report for unit U-295 |
| U-294 | Light Use | 10,112 | Oct 3, 2026 | Pass | View report for unit U-294 |
| U-293 | Light Use | 10,055 | Oct 3, 2026 | Pass | View report for unit U-293 |
| U-292 | Light Use | 10,134 | Oct 3, 2026 | Pass | View report for unit U-292 |
| U-291 | Light Use | 10,168 | Oct 3, 2026 | Pass | View report for unit U-291 |
| U-224 | Standard Use | 32,547 | Sep 24, 2026 | Pass | View report for unit U-224 |
| U-223 | Standard Use | 36,505 | Sep 24, 2026 | Pass | View report for unit U-223 |
Price history
Monthly median of what our own ST18000NM000J units sold for.
| Month | Median price |
|---|---|
| Oct 2026 | $417.96 |
ST18000NM000J questions
What is this drive typically used for?+
As an 18TB 3.5 inch SATA hard drive, the Exos X18 is suited to bulk storage roles such as network attached storage, backup targets, and capacity-oriented server storage where high per-drive capacity matters more than peak IOPS.
Will this drive work with my server or NAS?+
It uses a standard SATA 6Gb/s interface and a 3.5 inch form factor, so it is compatible with any system or NAS chassis that accepts standard SATA 3.5 inch drives.
What does the testing on each unit actually check?+
Every unit goes through a sequential and random read/write benchmark, a full extended self-test over the whole surface, a comparison of reported power-on hours against an independent on-drive log, SMART health checks for reallocated, pending, and uncorrectable sectors, and a NIST 800-88 sanitize with read-back verification. All 28 units in this batch passed every one of these checks.
What is the difference between the Light Use and Standard Use tiers for this model?+
The tiers are based on recorded power-on hours: Light Use covers drives with 500 to 20,000 hours (10 units in this batch), and Standard Use covers drives with 20,000 to 40,000 hours (18 units), with the full batch ranging from about 10,000 to 36,500 hours and a median near 25,500 hours.
How was data erased from these drives before resale?+
Each unit was sanitized using either a sanitize overwrite or an ATA secure erase, both followed by read-back verification as part of the NIST 800-88 sanitize process applied to every drive in this batch.