New WD2001FASS: writes are awfully slow (10% of the expected performance)

New 2TB WD2001FASS, Windows 7


Read performance seems fine, but writes are awful. Takes several hours to format a 50Gb partition.

HDTune file benchmark shows less than 10 Mb/sec for writes. Screen shot is here (blue are reads, orange are writes):


 I expect performance as measured here: and here 

Also, WD’s spec ( says 138 Mb/sec.

Windows driver configuration for the hd has checkmark next to “enable write caching for the device”.

I didn’t touch any jumpers. 

Is there anything I can try (jumpers, firmware update) ? Any help is greatly appreciated!

Maybe you should try contacting WD’s Technical Support about this. You can do so either by phone or email.

To Contact WD for Technical Support