compressed and tar file integrity

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# 1  
compressed and tar file integrity

How can I ensure the folder that I tar and compress is good to be archive in DVD or tape? Must I uncompress and untar the file, or there is any way to tell the integerity of the compressed file before send to archive? I have bad experience on this, which the archive compressed file cold not be opened, the error message is unexpected EOF. I guess it could be incomplete archive process.
# 2  
Most archiving programs have options to test files.

For both tar and gunzip it's usually -t.

You could then test the return code using $?
# 3  
But the file format is in file.tar.Z

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