9 drives tracked from $16.40/TB. Prices updated every 4 hours.
| $/TB ▲ | Brand / Model | Cap | Interface | Tech | Cache | Sector | Wty | Price | Cond. | 90D | Buy | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
👑$16.40 ~ Fair | WD Ultrastar DC 20TB Renewed WUH722020BLE6L4 Refurb · 5yr | 20TB | SATA-6G 7,200 RPM | ePMR | 512MB | 512e | 5yr | $327.99 | REFURB | ▲ | Buy →Details | ▼ |
$23.50 ~ Fair | WD Ultrastar DC HC570 20TB SATA WUH722020BLE6L4 5yr | 20TB | SATA-6G 7,200 RPM | ePMR | 512MB | 512e | 5yr | $469.99 | new | ▲ | Buy →Details | ▼ |
$36.36 ~ Fair | Synology HAT5300 20TB NAS Enterprise HAT5310-20T Refurb · CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $727.28 | REFURB | ▼ | Buy →Details | ▼ |
$42.28 ~ Fair | Synology HAT5300 20TB NAS Enterprise HAT5310-20T CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $845.68 | new | ▼ | Buy →Details | ▼ |
$— | MDD 20TB SATA 7200RPM NAS MD20TS25672NAS CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $— | — | Buy →Details | ▼ | |
$— | MDD 20TB SATA 7200RPM NAS MD20TSATA25672NAS CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $— | — | Buy →Details | ▼ | |
$— | Seagate Exos X20 20TB SATA ST20000NM007D 5yr | 20TB | SATA-6G 7,200 RPM | ePMR | 256MB | 512e | 5yr | $— | — | Buy →Details | ▼ | |
$— | Seagate IronWolf Pro 20TB NAS ST20000NT001 CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $— | — | Buy →Details | ▼ | |
$— | Seagate IronWolf Pro 20TB NAS ST20000NEZ00 CMR · 5yr | 20TB | SATA-6G 7,200 RPM | CMR | 256MB | 512e | 5yr | $— | — | 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.
20TB SATA drives are excellent for high-density RAID 6 arrays. A 12-bay NAS with 20TB drives in RAID 6 yields 200TB 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 20TB, 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 20TB SATA drops below your target $/TB.
SATA enterprise HDDs offer the best $/TB for bulk nearline storage, backup targets and cold archive tiers.