Restore extraction problems

Situation
I am attempting to restore my backup emr_back.tar file when I do so I get the following error;
extracting /home/emr_backup.tar
extractince /tmp/emr_backup.tar.gz…
tar (child)L …/openemr.tar.gz: cannot open: no such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not receoverable: exiting now
error: tart could not extract ‘tmp/emr_backup/openemr.tar.gz’

OpenEMR Version
I’m using OpenEMR version 4.2.1 restored recenty

Browser:
both chrome and firefox

Operating System
ubuntu 16.4

Logs
Did you check the logs?
No Which logs?
Was there anything pertinent in them? Paste them here (surround with three backticks (```) for readability

No. Which logs should i check - i am new to this? Tyran

Nothing is contained in the openemr log.
I managed to find that.

I found the following in the sys log
April 18th [sr 0…tag #0 failed rsulst …
…harware err [current]…
…logical unit failed self test…

Does this mean my dvd is bad ? Ths only happens with the tarball files. I Was able to transfer other files. Liek the restore macro. Please advise