This error occurs on my Western Digital Caviar series drive. Uncommenting '#apm = 256' to disable APM for this drive gets rid of the error message.
FWIW, the following check in '/lib/hdparm/hdparm-functions' to check the device path is incorrect: local ID_PATH="$(udevadm info -n "$1" -q property 2>/dev/null | sed -n 's/^ID_PATH=//p')" || true It should read: local ID_PATH="$(udevadm info -n "$1" -q property 2>/dev/null | sed -n 's/^DEVPATH=//p')" || true -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org