Interface: HDWD240UZSVA lists SATA 6 Gb/s; WD4005FZBX lists SATA 6Gb/s.
Recording: HDWD240UZSVA lists SMR; WD4005FZBX lists CMR.
Manufacturer limited warranty: HDWD240UZSVA lists 2 years (eligible new drives); WD4005FZBX lists 5 years (eligible new drives).

A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.

Specifications side by side

Show differences only

Manufacturer specifications for HDWD240UZSVA and WD4005FZBX
Specification	HDWD240UZSVA	WD4005FZBX
Manufacturer	Toshiba	Western Digital
Product family	P300	WD_BLACK
Model number	HDWD240UZSVA	WD4005FZBX
Capacity (TB)	4	4
Interface	SATA 6 Gb/s	SATA 6Gb/s
Recording	SMR	CMR
Form factor	3.5-inch	3.5-inch
Package / region	Bulk / EMEA	Not recorded
Manufacturer limited warranty	2 years (eligible new drives)	5 years (eligible new drives)
RPM	Not recorded	7200
Cache (MB)	Not recorded	256
Sustained transfer (up to MB/s)	Not recorded	202

Compatibility and buying checks

One or both drives use SMR recording. Check sustained-write and array requirements before choosing one for a NAS or a write-heavy workload.
Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.

Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.

Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.