I already did that and I found that hdparm is executed a lot of times just during one boot process :
https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695/comments/78
I already did that and I found that hdparm is executed a lot of times just during one boot process :
https:/ /bugs.launchpad .net/ubuntu/ +source/ acpi-support/ +bug/59695/ comments/ 78