tar header format

[root]

I have a tar saved disk that somehow has had the file header
information either removed or erased.  The data (ASCII) looks
intact, however.

Question:  Can someone explain how tar writes its file
information header to me so I can try to reconstruct (patch)
the disk for recovery?  Is there such a thing as tar.h?
 Thanks in advance...
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 Scotty
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