Start with the NBU Systems Administrators Guide, Appendix C.  You'll
want to read the sections on "Reading images with tar" and "Media
format".  

L

Jib Kinglu writes:
> Dear veritas list,
> Pardon for the trouble. Our school want
> to find document description of data layout on tape format
> for Netbackup  DLT tapes (tar) for full backup of 100G
> Solaris 2.8  filesystem. For example, directory position
> and file position. We using data from 2 DLT tapes.
> Thanking you,
> Mr. Jib Kinglu;
> SIT;
> Singapore
> 
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-- 
Larry Kingery 
              2 + 2 = 5 for extremely large values of 2.