# Install image to 2nd disk in system (Replace /dev/sdb to WD disk path!!!)
gunzip -c disk_image.10g.bin.gz | dd of=/dev/sdb bs=1M

# Resize partition 4 to maximum:
parted /dev/sdb
resizepart 4
# Type "100%" as "END" value
quit

# Resize file system
resize2fs /dev/sdb4