2 drives tracked from $17.78/TB. Prices updated every 4 hours.
| $/TB ▲ | Brand / Model | Cap | Interface | Tech | Cache | Sector | Wty | Price | Cond. | 90D | Buy | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
👑$17.78 ~ Fair | MDD 18TB SAS 12G 7200RPM Enterprise MDD18TSAS25672E CMR · 5yr | 18TB | SAS-12G 7,200 RPM | CMR | 256MB | 512e | 5yr | $319.99 | new | ▲ | Buy →Details | ▼ |
$18.89 ~ Fair | MDD 18TB SAS 12G 7200RPM Enterprise MDD18TSAS25672E CMR · 5yr | 18TB | SAS-12G 7,200 RPM | CMR | 256MB | 512e | 5yr | $339.99 | new | ▲ | Buy →Details | ▼ |
18TB SAS vs 18TB 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.
18TB SAS drives are ideal for high-density RAID 6 arrays. A 60-drive 4U JBOD with 18TB drives in RAID 6 delivers over 1044TB 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 18TB 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 18TB SAS drops below your target $/TB.
SAS enterprise HDDs suit nearline and backup workloads requiring dual-port multipath and high sustained throughput.