I wanted to delete my old time machine backup from my western digital mybook world
i didnt need it for anything, as I have a backup of it :D

i found two ways to do it.

method 1 – ssh.

if you have ssh enabled on your mybook world then you can

open terminal > ssh to your mybook

rm -rf /DataVolume/.timemachine
mkdir /DataVolume/.timemachine
chmod 777 /DataVolume/.timemachine