Originally Posted by Emmanuel_uk
I have never managed to make hdparm to work with my sata drives (in retrospect it is probably a feature).
Seems SATA drives automatically work at the right speed.
So I also suspect your HD are working in legacy mode.
Yup. With a 2.6 kernel, SATA drives are operated through the libata driver, and will show up as /dev/sdX.
Hdparm doesn't work with scsi; try Dougls Gilberts sdparm from http://www.torque.net/sg/sdparm.html
, which also has pointers to his sg-utils, for more fun with scsi/sata stuff. Not everything in hdparm is supported in sdparm though.