Note, the hard drive in /etc/hdparm.conf can be specified by one of its several names, possibly a different name from that which acpi-support is using, e.g. /dev/disk/by-id/ata-ST320423A_3EJ0GMSY versus /dev/sdb.
Note, the hard drive in /etc/hdparm.conf can be specified by one of its several names, possibly a different name from that which acpi-support is using, e.g. /dev/disk/ by-id/ata- ST320423A_ 3EJ0GMSY versus /dev/sdb.