Hard drive now showing as RAW, why?

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I have a second hard drive in my PC and now all the files appear to be lost
and in device manager the file system is showing as RAW.

When I try to access the drive I get the message

F:\ is not accessible
The file or directory is corrupt and unreadable

I would like to know what has caused this and how to fix it, I was under the
impression that NTFS kept four copies of the file allocation tables so this
should be restorable.


.

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