Tape Problem

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http://www.linuxquestions.org – Hello Dears, I have problem with reading files backed up on a tape I have three backed up files, when I run tar tvf /dev/nst0, the first file returns, then when I run the same command again, the following error returns: tar: /dev/nst1: Cannot read: Input/output error tar: At beginning of tape, quitting now tar: Error is not recoverable: exiting now But when I run the same command for the third time, it returns the second file. what is the problem? (HowTos)