Used
$23.22/TB
18TBSATA
Seagate Exos X18 ST18000NM000J 18TB 7.2K 6G SATA 3.5" HDD (Used, Tested)
Seagate
from$417.96
In stock18TB Hard Drives
18TB enterprise hard drives are a common size in recent datacenter deployments. Retired units reach the used market regularly. Models include the Seagate Exos X18 (such as the ST18000NM000J), the WD Ultrastar DC HC550 (such as the WUH721818AL5204) and WD Gold 18TB, all helium-sealed and available in SAS and SATA versions. They suit large NAS units, ZFS pools built for capacity, surveillance and media storage, and backup targets where fewer, larger drives keep power and bay counts down. Because a rebuild at this size takes a long time, double parity layouts such as RAID 6 or RAIDZ2 are common. Before ordering, check the interface and sector format against your controller and compare the power-on hours we list for each unit. Every used drive here passes SMART health and an extended self-test before it ships.
3 in stock · Tested in-house · 30-day returns
18TB Hard Drives: common questions
Are SAS and SATA 18TB drives the same apart from the interface?+
The mechanics are usually shared within a model family, but the firmware, connector and part number differ. Pick by your host: SATA for motherboard ports and most NAS units, SAS for HBAs and server backplanes that support it.
How do I know how many hours a drive has?+
We read power-on hours from the drive’s own SMART counter. On certified listings they are printed on the certificate in the box and shown on the unit’s public test report. The counter stays on the drive, so you can read it yourself on arrival with any SMART tool.
What warranty comes with these drives?+
Used drives carry a 90-day warranty, and certified tiers carry up to 2 years; the exact term is on each listing. New sealed drives keep the manufacturer warranty. Every order also has 30-day returns.