#!/bin/bash

rootDev="$(mount | grep "on / " | cut -c 1-8)"

case "$1" in
    reboot|kexec)
        # Do not park disks when rebooting or switching kernels
        ;;
    *)
        for blockDev in /sys/block/sd*; do
            Dev="/dev/${blockDev##*/}"
            if [ "$rootDev" != "$Dev" ]; then
                /sbin/hdparm -y "$Dev"
            fi
        done
        /sbin/hdparm -y "$rootDev"
        ;;
esac