If Power-up in Standby is activated on a WD2500KS Sata hdd by ATA command using for ex. hdat2, the drive marks this feature as unavailable but reports it as activated. the drive does not start until it recieves the spin-up command and a lot of sata controllers do not suport it.
the triky part is that if the drive marks this feature as unavailable it cannot be deactivated. any request to do so fails with with i/o error (hdparm in linux) or is not even displayed any more as an option in hdat2.

do you have any idea or tool to deactivate thist option ?

thanks in advance...

In WD SATA drives this option can be enabled or disabled by jumper settings...take a look on the label of the hdd.You'll see there how to work with jumpers.

Or on WD web site you'll find the manual for this drive and ,if u read it, you will find the answers.

Rgds

_________________
www.datasave.ro

What you say is true, but has nothing to do with my problem :d please read again.

You can activate Powerup in standby using jumper, you can deactivate removing jumper. True.

You can activate Powerup in standby using ATA command, you can not deactivate it anymore (has nothing to do with jumper), and that's the real problem !