I am afraid that hdparm -B 254 or 255 do not work for every laptop. I have a Dell latitude c840 with a Hitachi travelstar DK23EA-30 that is completly unresponsive to any hdparm -B setting I have tried.
It doesn't even allow me to change default APM levels with the Hitachi feature tool boot disk.
Wolfrichi:
I am afraid that hdparm -B 254 or 255 do not work for every laptop. I have a Dell latitude c840 with a Hitachi travelstar DK23EA-30 that is completly unresponsive to any hdparm -B setting I have tried.
It doesn't even allow me to change default APM levels with the Hitachi feature tool boot disk.