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At first my pc suddenly cannot detect the external HD, then it detected after multiple times of trying (plug and unplug).

But it said cannot access must format HD before I can access it.

I formatted it and but now got this problem...

When I tried to copy files to my external HD, it took almost an hour and sometimes it hang! The file is only 200MB.

When I tried to format it again with /q option It said was unable to format.
When I tried to format it. C:\format e: It showed 0% after half an hour.

What's wrong with my ext HD?

Please help.

Maxtor Basics Desktop 1000GB
OS: Windows Vista