20TB SAS is aimed at high-density storage where each bay needs to carry substantial capacity. Current enterprise families from major vendors offer SAS options at this tier. Below you can compare current 20TB enterprise SAS HDDs, same-capacity SATA alternatives, and the HBA or cabling hardware you may need to use the drive correctly.
20TB SAS makes sense when bay efficiency matters. Compare its $/TB with 18TB, 22TB and 24TB and make sure your array design accounts for longer rebuild workloads.
See compatible products ↓Current 20TB SAS Hard Drives on Amazon 4
Compare 20TB enterprise SAS HDDs here. SATA versions, SAS SSDs, smaller high-RPM drives, trays, cables and accessories are kept separate so you can compare like with like.
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Seagate Exos X24 20TB Enterprise Internal Hard Drive HDD - 12GB/s SAS 7200RPM 2.5M MTBF (ST20000NM002H)
20TB · $48.00/TB
WD Ultrastar DC HC560 WUH722020BL5204 20 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS) - 7200rpm - 4Kn Format - 5 Year Warranty
20TB · $53.00/TB
Seagate Exos X20 ST20000NM002D 512E/4KN SAS 12Gb/s 20TB 7200RPM 256MB Enterprise Hard Drive,Mechanical Hard Disk
20TB · $49.72/TB
WD Ultrastar DC HC560 - Hard Drive - 20 TB - Internal - 3.5" (8.9 cm) - SAS 12Gb/s - 7200 RPM - Buffer: 512 MB
20TB · $74.47/TB
20TB Enterprise SATA Alternatives 4
These are enterprise SATA HDDs, shown separately so a lower-cost SATA listing is never mistaken for a SAS drive. They can make sense when your server does not require SAS features.
Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C
20TB · $45.52/TB
Western Digital Ultrastar WUH722020CLE6L4 20 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) Method
20TB · $49.95/TB
Toshiba 20TB MG10ACA20TE SATA 600GB 20in1 HDD
20TB · $54.45/TB
Seagate Exos X20 ST20000NM000D 20 TB Hard Drive - Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage System, Video Surveillance System Device Supported - 7200rpm - 285
20TB · $49.72/TB
SAS Hardware You May Also Need 8
A SAS hard drive needs the right host hardware. Compare HBAs and cables only after checking the connector on your controller or backplane.
SAS HBA Card Compatible with LSI 9300-8i IT Mode 9211-8i 9207-8i | PCIe 3.0 x8, 2x 8643 Internal, PCIe SATA Expansion Card, 12Gb/s SAS + SATA 6Gb/s, HBA Controller for ZFS TrueNAS unRAID NAS
SAS infrastructure
SAS HBA Card Compatible with LSI 9300-8i & D3307 IT Mode HBA Controller | SAS3008, PCIe 3.0 x8, 2x SFF-8643 Internal, 12Gb/s SAS + SATA 6Gb/s, PCIe SATA Expansion Card for ZFS TrueNAS unRAID NAS
SAS infrastructure
2-Pack SFF-8643 to 4x SFF-8482 SAS Forward Breakout Cable 0.5m, 12Gbps | Two 0.5m/1.6ft SAS-3 cables with 29+15-pin power connect up to 8 SAS HDDs/SSDs; for LSI 9300-8i and Broadcom 9400-8i
SAS infrastructure
LSI Logic SAS 9300-8e SGL LSI00343
SAS infrastructure
ADCAUDX Mini-SAS to SAS Cable: 0.5M SFF-8087 to SAS SFF-8087 to SFF-8482 | 4X SFF-8482 Connector with SATA Power Adapter Cable (1.6FT)
SAS infrastructure
Sonilco Storage Configurations Cable Mini SAS HDD SFF-8643 to 4 SFF-8482 with 15-pin Power Port Cord (1 Cable, 0.5 Meter / 1.6 Feet)
SAS infrastructure
NGFF Internal Slimline SAS HD SFF-8654 Host Controller to 4 SFF-8482 Target SAS Hard Disk and SATA Power Breakout Fanout Cable (100cm)
SAS infrastructure
CableCreation Mini SAS 26Pin (SFF-8088) Male to 4 SATA 7Pin Female Cable, Mini SAS Host/Controller to 4 SATA Target/Backplane, 1M / 3.3FT
SAS infrastructure
SAS cables are not universal. Confirm the HBA, backplane and connector standard before ordering.
Why this buying advice matters
20TB SAS is aimed at high-density storage where each bay needs to carry substantial capacity. Current enterprise families from major vendors offer SAS options at this tier.
What should you compare before buying?
| Option | Best fit | Check before buying |
|---|---|---|
| 20TB Seagate Exos SAS | High-capacity server and array use | Verify exact SAS part number |
| 20TB WD Ultrastar SAS | Enterprise storage and dense arrays | Verify SAS model and sector format |
| 20TB Toshiba MG SAS | Enterprise capacity alternative | Verify MG SAS part number |
| 20TB enterprise SATA | Lower controller complexity | Not a SAS replacement when SAS features are required |
SAS Price per TB Calculator
Compare two drives using the same currency and condition.
SAS hard drive buying guide
Is a 20TB SAS hard drive the right size?
How to compare 20TB SAS prices
Compare only clearly identified 20TB SAS HDDs at the same condition. Divide the current drive price by 20 to get a simple price-per-TB figure, then compare that with the neighboring capacity pages.
For an array, multiply the drive price by the planned drive count and divide by usable capacity after redundancy. That exposes cases where a slightly larger drive reduces bay and controller requirements enough to justify the higher unit price.
What to check before installing a 20TB SAS drive
Confirm the HBA or RAID controller supports the drive, and match the cable to the controller connector. A SAS drive cannot be made compatible with a SATA-only motherboard port through a passive adapter.
For replacements, check the existing array sector format, tray or caddy, firmware expectations and actual usable capacity. Enterprise labels can look similar even when the interface or format differs.
When a SATA alternative makes more sense
A same-capacity enterprise SATA drive can be a sensible alternative in a server that does not require dual-port SAS and already has SATA connectivity.
Keep SATA alternatives separate from the SAS results so the cheaper interface is not mistaken for a like-for-like SAS replacement.
Related SAS buying guides
Frequently asked questions
What is a good price for a 20TB SAS hard drive?
Use the current price per TB rather than a fixed threshold. Divide the live price by 20 and compare it with neighboring capacities and the same-capacity SATA alternatives.
Can I use a 20TB SAS drive in a normal desktop?
Yes only with a compatible SAS HBA or controller and the correct cable. A standard SATA motherboard port cannot directly run a SAS drive.
Should I buy 20TB SAS or SATA?
Choose SAS when your server, backplane or storage design requires SAS features. Choose SATA when the system supports it and lower cost or simpler connectivity is more important.
Do all 20TB enterprise drives use the same sector format?
No. Check the exact listing and model documentation for 512e, 4Kn or other enterprise formatting before adding it to an existing array.
Manufacturer and platform references
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