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Sounds a bit like a write sequence has been interupted either by a power failure, bad connection (USB cable) or accidental removal. In which case the error inhibits the Partition table,Directory or FAT table from being accessed.
There are repair programs that can fix this kind of fault without data loss. ScanDisk may even fix it. The ease of examining the disk will depend on your operating system. The current O/S's are not DOS based and the repair programs need to load a version of DOS so that the HDD can be addressed natively.
The MBR may also be corrupt. These programs can also write a generic MBR.
Barry
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