Oh, and as a confirmation of the hdparam thing on the WD GP 500 :
~$ sudo hdparm -B 254 /dev/sda
/dev/sda: setting Advanced Power Management level to 0xfe (254) HDIO_DRIVE_CMD failed: Input/output error
Oh, and as a confirmation of the hdparam thing on the WD GP 500 :
~$ sudo hdparm -B 254 /dev/sda
/dev/sda:
setting Advanced Power Management level to 0xfe (254)
HDIO_DRIVE_CMD failed: Input/output error