Spin down unused ATA disks on Linux

spindown.sh

#!/bin/sh
echo -n 'Spinning down unused ATA drives:'
/usr/bin/lsscsi | /bin/grep -w -F ATA | /bin/cut -c54- \
| while read dev ; do
	if /bin/mount | /bin/grep -q -E "^$dev[^/]* " ; then continue ; fi
	echo -n " $dev,"
	/sbin/hdparm -q -Y "$dev"
done
echo ' done.'

This script looks for ATA disks that have no mounted partitions and spins them down.

It used to be part of my init scripts on a machine with a few spare disks attached.