12 drives tracked from $17.17/TB. Prices updated every 4 hours.
| $/TB ▲ | Brand / Model | Cap | Interface | Tech | Cache | Sector | Wty | Price | Cond. | 90D | Buy | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
👑$17.17 ~ Fair | WD Ultrastar DC HC550 18TB SATA WUH721818ALE6L4 5yr | 18TB | SATA-6G 7,200 RPM | ePMR | 512MB | 512e | 5yr | $309.00 | new | ▲ | Buy →Details | ▼ |
$20.56 ~ Fair | Toshiba MG09 18TB SATA Enterprise HDEPZ10LFB51 CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 512MB | 512e | 5yr | $370.01 | new | ▲ | Buy →Details | ▼ |
$21.67 ~ Fair | MDD 18TB SATA 6G 7200RPM NAS MD18TSATA25672NAS CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $389.99 | new | ▲ | Buy →Details | ▼ |
$21.67 ~ Fair | MDD 18TB SATA 7200RPM Enterprise MDD18TSATA25672E CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $389.99 | new | ▲ | Buy →Details | ▼ |
$22.22 ~ Fair | Toshiba MG09 18TB SATA MG09ACA18TE CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 512MB | 512e | 5yr | $399.99 | new | ▲ | Buy →Details | ▼ |
$22.22 ~ Fair | MDD 18TB SATA 7200RPM NAS MDD18TS25672NAS CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $399.99 | new | ▲ | Buy →Details | ▼ |
$24.94 ↓ Good | Seagate Exos X20 18TB SATA ST18000NM003D Refurb · 5yr | 18TB | SATA-6G 7,200 RPM | ePMR | 256MB | 512e | 5yr | $449.00 | REFURB | ▼ | Buy →Details | ▼ |
$25.56 ~ Fair | WD DC HC550 18TB SATA 512MB Enterprise WUH721818ALE6L4 Refurb · 5yr | 18TB | SATA-6G 7,200 RPM | ePMR | 512MB | 512e | 5yr | $460.00 | REFURB | ▼ | Buy →Details | ▼ |
$30.56 ~ Fair | WD DC HC550 18TB SATA 512MB Enterprise WUH721818ALE6L4 5yr | 18TB | SATA-6G 7,200 RPM | ePMR | 512MB | 512e | 5yr | $549.99 | new | ▼ | Buy →Details | ▼ |
$37.50 ↑ High | Seagate Exos X20 18TB SATA ST18000NM003D 5yr | 18TB | SATA-6G 7,200 RPM | ePMR | 256MB | 512e | 5yr | $675.00 | new | ▼ | Buy →Details | ▼ |
$— | MDD 18TB SATA 7200RPM 5yr Warranty MDD18TSATA25672E CMR · 5yr | 18TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $— | — | Buy →Details | ▼ | |
$— | Toshiba N300 18TB NAS HDWG51JUZSVA CMR · 3yr | 18TB | SATA-6G 7,200 RPM | CMR | 512MB | 512e | 3yr | $— | — | Buy →Details | ▼ |
14-20TB drives are the workhorses of enterprise storage arrays. A single 4U JBOD with 60 x 20TB delivers over 1PB of raw storage.
WD Ultrastar DC HC550 (18TB) and HC560 (20TB) use ePMR technology - a CMR variant that is fully RAID compatible despite the different recording method.
Large-capacity nearline drives are ideal for AI training data lakes where sequential read throughput matters more than random IOPS.
$/TB at these capacities has been declining steadily. Wait for quarterly promotions if not urgent - prices can swing 15-20% on enterprise bulk.
18TB SATA drives are excellent for high-density RAID 6 arrays. A 12-bay NAS with 18TB drives in RAID 6 yields 180TB usable storage.
Seagate Exos X18/X20, WD Ultrastar HC550/HC560, and MDD Enterprise are the main options. WD drives at 18TB+ use ePMR technology.
At 18TB, both new and refurbished options offer good value. New MDD drives with 5-year warranties are often priced close to refurbished brand-name units. Renewed Exos and Ultrastar drives are reliable choices for secondary storage.
Get emailed when 18TB SATA drops below your target $/TB.
SATA enterprise HDDs offer the best $/TB for bulk nearline storage, backup targets and cold archive tiers.