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Backup to SCSI tape drive stops at point it is going to write a file

I have a SCO OpenServer 5.0.6 system running BackupEdge software with a Quantum Model # STD2401LW DAT Tape drive and Adaptec SCSI Card 29160.  All of a sudden when doing a full system backup the backup stops when it reaches a file that actually has data in it.  
I tried changing the tape drive to another same model, I tried changing the SCSI card to another with same model, and I tried changing the board to another slot on the motherboard.  None of those things work.  It keeps doing the same thing.
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David
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It is not even logging an error from BackupEdge.  It just stops and hangs forever at the file when I look at the backup file that is created.
/usr/adm/messages and /usr/adm/syslog do not show any errors.
I will try tar.
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It typically displays the file AFTER it has been written, so if there is a read error it will almost always be a different file. You need to look at the system logs to determine what file had a read problem (if any)
I thought I said that - maybe not quite clear enough - sorry.
Also - with SCO I think the logs are under /var/adm/*
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One thing I forgot to mention and don't know if it makes a difference is that I can get a full listing of the contents of the tape and I can read the label so the reading part of it is working.  What is not working is writing to the tape.
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Here is the output of dfspace...
# dfspace
/         :     Disk space: 71736.42 MB of 75778.38 MB available (94.67%).
/stand    :     Disk space:   6.16 MB of  14.99 MB available (41.10%).

Total Disk Space: 71742.59 MB of 75793.38 MB available (94.66%).
Here is the result of the tar, it got stuck for hours after the second file.  Once this happens, I cannot kill the tar process or stop it in any way.  The only way is to reboot and remove the tape.
#tar cvf /dev/rStp0 /usr/aph
a /usr/aph/.profile 9 tape blocks
a /usr/aph/db/TBOCDT 27824 tape blocks

ONLY doing software compresses on BackupEdge not both.
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Thanks for having me try different things.  The problem was the SCSI cable.  It is working now.

Thanks,