[ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
# check that the device is an USB device
- if readlink /sys/block/${DEVICE} | grep -q usb ||
- readlink /sys/block/${DEVICE}/device | grep -q usb # linux < 2.6.29
+ if readlink /sys/block/${DEVICE} | grep -q usb
then
return 0
fi