NAS Drive Compatibility

Western Digital Consumer 640GB

Other HDD

Part number WD6400AACS · Consumer series · SATA 3Gb/s (SATA II). If your machine is listed below, this drive is officially supported — not a forum workaround.

ConsumerNAS HARD DRIVE3.5" SATA HDDWESTERN DIGITAL

Part of the Western Digital Consumer series →

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48
Compatible NAS models
0 Syn · 48 QNAP · 0 Asus · 0 TM
By vendor
640 GB
Listed capacity
Western Digital
Manufacturer
3-2-1 cold backup fit

No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.

Compatibility verdict

It appears on the official compatibility lists of 48 machines and series — 48 QNAP. Check the class badge above: drives tagged NAS or Enterprise are built for 24/7 multi-bay operation. Desktop-class drives often lack vibration resistance and are usually absent from vendor HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.

Compatible NAS models

QNAP TS-109 II See its full HCL → QNAP TS-109 Pro See its full HCL → QNAP TS-109 Pro II See its full HCL → QNAP TS-1269U-RP See its full HCL → QNAP TS-209 II See its full HCL → QNAP TS-209 Pro See its full HCL → QNAP TS-209 Pro II See its full HCL → QNAP TS-239 Pro See its full HCL → QNAP TS-239 Pro II See its full HCL → QNAP TS-239 Pro II+ See its full HCL → QNAP TS-259 Pro See its full HCL → QNAP TS-259 Pro+ See its full HCL → QNAP TS-269L See its full HCL → QNAP TS-269 Pro See its full HCL → QNAP TS-409U See its full HCL → QNAP TS-409 Pro See its full HCL → QNAP TS-439 Pro See its full HCL → QNAP TS-439 Pro II See its full HCL → QNAP TS-439 Pro II+ See its full HCL → QNAP TS-459U-RP+ SP+ See its full HCL → QNAP TS-459 Pro See its full HCL → QNAP TS-459 Pro+ See its full HCL → QNAP TS-459 Pro II See its full HCL → QNAP TS-469L See its full HCL → QNAP TS-469U-RP See its full HCL → QNAP TS-469U-SP See its full HCL → QNAP TS-469 Pro See its full HCL → QNAP TS-509 Pro See its full HCL → QNAP TS-559 Pro See its full HCL → QNAP TS-559 Pro+ See its full HCL → QNAP TS-559 Pro II See its full HCL → QNAP TS-569L See its full HCL → QNAP TS-569 Pro See its full HCL → QNAP TS-639 Pro See its full HCL → QNAP TS-659 Pro See its full HCL → QNAP TS-659 Pro+ See its full HCL → QNAP TS-659 Pro II See its full HCL → QNAP TS-669L See its full HCL → QNAP TS-669 Pro See its full HCL → QNAP TS-809U-RP See its full HCL → QNAP TS-809 Pro See its full HCL → QNAP TS-859U-RP See its full HCL → QNAP TS-859U-RP+ See its full HCL → QNAP TS-859 Pro See its full HCL → QNAP TS-859 Pro+ See its full HCL → QNAP TS-869L See its full HCL → QNAP TS-869U-RP See its full HCL → QNAP TS-869 Pro See its full HCL →

Same-capacity alternatives

Other drives listed at 640 GB capacity, ranked by how many machines list them:

Western Digital WD6400AAKS 146 machines · Western Digital WD6401AALS 72 machines · Consumer Western Digital WD6402AAEX 72 machines · Consumer Seagate ST3640323AS 72 machines · Consumer BarraCuda Samsung HD642JJ 72 machines · Consumer Toshiba MK6459GSXP 53 machines · Hitachi HDT721064SLA360 32 machines · Consumer

Quick answers

Is the WD6400AACS officially compatible with my NAS?

It appears on the official compatibility lists of 48 machines and series — 48 QNAP. Every machine page linked below shows the vendor's own list entry, refreshed daily.

Is the WD6400AACS a good NAS drive?

Check the class badge above: drives tagged NAS or Enterprise are built for 24/7 multi-bay operation. Desktop-class drives often lack vibration resistance and are usually absent from vendor HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.

Can I use the WD6400AACS for a 3-2-1 cold backup copy?

No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.

What are alternatives to the WD6400AACS?

At the same capacity, the most widely listed alternatives are Western Digital WD6400AAKS (146 machines), Western Digital WD6401AALS (72 machines), Western Digital WD6402AAEX (72 machines). The full ranked list is below.