2 drives tracked from $15.50/TB. Prices updated every 4 hours.
| $/TB ▲ | Brand / Model | Cap | Interface | Tech | Cache | Sector | Wty | Price | Cond. | 90D | Buy | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
👑$15.50 ~ Fair | MDD 20TB SAS 12G 7200RPM Enterprise MDD20TSAS25672E CMR · 5yr | 20TB | SAS-12G 7,200 RPM | CMR | 256MB | 512e | 5yr | $309.99 | new | ▲ | Buy →Details | ▼ |
👑$15.50 ~ Fair | MDD 20TB SAS 12G 7200RPM Enterprise MDD20TSAS25672E CMR · 5yr | 20TB | SAS-12G 7,200 RPM | CMR | 256MB | 512e | 5yr | $309.99 | new | ▲ | Buy →Details | ▼ |
20TB SAS vs 20TB SATA → (coming soon)
MDD (MaxDigital Data) drives are rebranded enterprise mechanisms at steep discounts. They ship new with 5-year warranties and are identical internally to Seagate Exos or HGST Ultrastar.
Energy-assisted PMR (ePMR) is used by WD Ultrastar DC HC550+ for 18TB+. It is NOT shingled - ePMR is a CMR variant that uses current-assisted recording for higher density. Safe for all workloads.
14-20TB nearline SAS drives currently offer the best $/TB in enterprise storage. Larger capacities may have better density but carry a price premium per TB.
At 14TB+ there is often a SATA equivalent at lower cost. SAS is worth the premium if you need dual-port multipath, faster error recovery, or SAS expander backplanes.
20TB SAS drives are ideal for high-density RAID 6 arrays. A 60-drive 4U JBOD with 20TB drives in RAID 6 delivers over 1160TB usable. MDD and Seagate Exos dominate this capacity.
MDD MaxDigitalData and Seagate Exos dominate high-capacity SAS. MDD offers new drives with 5-year warranties, often at the best $/TB in the entire SAS category.
New 20TB SAS drives from MDD and Seagate are available with full warranties. Refurbished HGST Ultrastar pulls offer significant savings. For mission-critical storage, buy new. For secondary/backup, refurb is a smart choice.
Get emailed when 20TB SAS drops below your target $/TB.
SAS enterprise HDDs suit nearline and backup workloads requiring dual-port multipath and high sustained throughput.