Cache (MB): WD100EAGZ lists 512; WD101FZBX lists 256.
Manufacturer limited warranty: WD100EAGZ lists 2 years (eligible new drives); WD101FZBX lists 5 years (eligible new drives).
Sustained transfer (up to MB/s): WD100EAGZ lists 260; WD101FZBX lists 263.

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 WD100EAGZ and WD101FZBX
Specification	WD100EAGZ	WD101FZBX
Manufacturer	Western Digital	Western Digital
Product family	WD Blue	WD_BLACK
Model number	WD100EAGZ	WD101FZBX
Capacity (TB)	10	10
RPM	7200	7200
Interface	SATA 6Gb/s	SATA 6Gb/s
Recording	CMR	CMR
Cache (MB)	512	256
Form factor	3.5-inch	3.5-inch
Physical sector size (bytes)	4096	Not recorded
Manufacturer limited warranty	2 years (eligible new drives)	5 years (eligible new drives)
Sustained transfer (up to MB/s)	260	263

Compatibility and buying checks

Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.

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

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