I'm using a 160GB Hitachi External HDD. When I was creating partitions, I accidentally formatted it from NTFS to RAW.
I tried to format it back to NTFS, but I got an error ("could not format").
I then tried to run
chkdsk on it, but
chkdsk doesn't work with RAW.
So then I tried with
DiskPart, but the same formatting error occurred ("the request could not be performed because of an i/o device error").
I don't care if I lose any data, I just want to get my disk back in a usable state.