"tar" Check sum error

I have a tar file that contains some 50 files in it. while trying to untar i get a checksum error. iam unable to retreive the fiiles from that. Can anyone please help me...?

Which command you are using for the same. Pls provide the full details

tar -xvf clm.tar US020.clm.bz2 is the command i used.

Checksum errors are a real problem with the command. Can I assume that the tar file is on disk? Also the tar file was sent by someone else or did you create it yourself? The checksum error usual points to a block size problem so you could try different block lengths when trying to check the archive. I would also suggest you use tar -tvf until you have a sensible output. Then use the extract.