My external cannot format

hello,anybody can help me too solve my problem…my external hardisk (500g) cannot be format even no data inside but time taken too long.

Try using DLG to write zeros and then try again to format the hard drive, if that doesn’t work replace it. Check the link below for the steps.

http://wdc.custhelp.com/app/answers/detail/a_id/1211/session/L3RpbWUvMTM1MDU5NjU4OC9zaWQvUGwxWVUyOWw%3D