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need clarification on tar & mt


Would some kind soul please clarify:

1) The following tar command will put one or two file marks at the end?
   tar c -f /dev/nst0 /some/dir

Some documentation says it will put two, but it doesn't seem to be the case.

2) To verify the file above, should one use:

   mt bsf 2
   mt fsf
   tar d -f /dev/nst0 /some/dir

? If so, it means only one file mark has been written by tar in 1)? In that
case, how can the tape know how many files are there on the tape?


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