I mean how do I view what files and folders contained inside the tape drive. 
Please help. Thanks.

# mminfo -aq volume=<volumename>,client=<clientname> -r nsavetime

Then use nsrinfo to retrieve the files within the saveset:
# nsrinfo -t <nsavetime from mminfo> <clientname>

Dennis

--
************************************************************************

  D. Voetelink
  Systems Engineer

  Energy research Centre of the Netherlands (ECN)
  ICT Services

  Petten, Netherlands

  e-mail : voetelink AT ecn DOT nl
  phone  : (+31) 224 564738

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