My 500GB Buffalo external HDD became RAW file system

My ext HDD Buffalo 500Gb became RAW file system. can't even reformat again to NTFS.or to FAT32, the drive has my name before. now i can see LOCAL DRIVE E:, and when i click to properties, i can see, used space 0 bytes, and free space 0 bytes.
i tried several ways, even on command prompt, convert E: /fs:ntfs. still i can't, and on disk management, i even apply mark partition as active and then format it, and it take 5-6 hours and at the end falure.

can some one help me, i really need for my school project, and i cannot efford to buy again.

JIGME

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hi

just follow the instruction on this forum
forums.techarena.in/tips-tweaks/1352757.htm

i too had the same problem, it solved my issue and i have all my files back without using and recovery software

i performed the rewrite of the boot sector