6TB sits between older 4TB fleets and the larger capacities that now dominate new storage builds. It can be a sensible replacement size when matching an existing vdev or RAID group matters more than maximum density. Below you can compare current 6TB enterprise SAS HDDs, same-capacity SATA alternatives, and the HBA or cabling hardware you may need to use the drive correctly.
Choose 6TB SAS when it matches an installed array or budget target. For a new build, compare 8TB, 10TB and 12TB because they may offer better bay efficiency.
See compatible products ↓Current 6TB SAS Hard Drives on Amazon 3
Compare 6TB 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 7E8 ST6000NM029A 6 TB Hard Drive - Internal - SAS (12Gb/s SAS) - 7200rpm - 512e Format - 5 Year Warranty
6TB · $53.00/TB
HGST Ultrastar He6 6TB 3.5" SAS 7200 RPM Enterprise Internal Hard Drive - SAS 64 Mb Cache, 12Gb/s - HUS726060als640 / 0F18370 64 MB Cache 3.5-Inch Internal Bare or OEM Drives 0F18370
6TB · $37.50/TB
Seagate Exos 7E10 ST6000NM020B 6 TB Hard Drive - Internal - SAS (12Gb/s SAS) - Storage System, Video Surveillance System Device Supported - 7200rpm
6TB · $65.49/TB
6TB Enterprise SATA Alternatives 6
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 7E8 6TB Internal Hard Drive Enterprise HDD – CMR 3.5 Inch 512E SATA 6Gb/s 7200 RPM 128MB Cache for Enterprise, Data Center – Frustration Free Packaging (ST6000NM021A)
6TB · $54.73/TB
HGST Ultrastar He6 6TB 3.5" SATA 7200 RPM Enterprise Internal Hard Drive with 64Mb Cache - HUS726060ALA640/ 0F18335 64 MB Cache 3.5-Inch Internal Bare or OEM Drives 0F18335
6TB · $22.50/TB
Seagate Enterprise ST6000NM0125 6TB 7200RPM SATA 6.0 GB/s 256MB 4Kn Enterprise Hard Drive (3.5 inch, Exos 7E8 HDD 4KN SATA)
6TB · $64.90/TB
HGST Ultrastar 7K6000 HUS726060ALE610 0F23001 6TB 7200 RPM SATA 3.5" 512E ISE 128MB Cache Enterprise Hard Drive
6TB · $31.67/TB
Seagate Exos 7E8 ST6000NM021A 6 TB Hard Drive - Internal - SATA (SATA/600)
6TB · $66.67/TB
Western Digital 6TB Ultrastar DC HC310 SATA HDD - 7200 RPM Class, SATA 6 Gb/s, 256MB Cache, 3.5" - HUS726T6TALE6L4
6TB · $65.74/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
6TB sits between older 4TB fleets and the larger capacities that now dominate new storage builds. It can be a sensible replacement size when matching an existing vdev or RAID group matters more than maximum density.
What should you compare before buying?
| Option | Best fit | Check before buying |
|---|---|---|
| 6TB Seagate Exos SAS | High-capacity server and array use | Verify exact SAS part number |
| 6TB WD Ultrastar SAS | Enterprise storage and dense arrays | Verify SAS model and sector format |
| 6TB Toshiba MG SAS | Enterprise capacity alternative | Verify MG SAS part number |
| 6TB 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 6TB SAS hard drive the right size?
How to compare 6TB SAS prices
Compare only clearly identified 6TB SAS HDDs at the same condition. Divide the current drive price by 6 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 6TB 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 6TB SAS hard drive?
Use the current price per TB rather than a fixed threshold. Divide the live price by 6 and compare it with neighboring capacities and the same-capacity SATA alternatives.
Can I use a 6TB 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 6TB 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 6TB 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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