Restore tar using CPIO

How can I restore a tape using cpio that may have been created with tar. currently I use this command to restore cpio tapes

cpio -icvduC32768 -I/dev/rmt/ctape1 "DATA/*" , but this does not work on the tar tape.


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why not using tar?
petro2Author Commented:
The tape was created on SCO and I am using unixware now.  I tried using
tar -xvAf /dev/rmt/ctape1 DATA, and it is super slow....
I guess you just need to use the proper blocksize ...
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petro2Author Commented:
How can I figure out what he block size is suppose to be?
pax -rv <file.tar
For tape

type mt status
then type
mt blocksize 0 <=== this is most likely
time tar t
mt blocksize 512
time tar t
mt blocksize 1024

and so on up to 4mbytes block


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