Person wrote:

5. The Dell tech says it must be corrupt.

If you have moved the PST from the DVD to your hard drive and have removed
the read-only attribute, then the Dell tech is correct. The file was most
likely corrupted by the method you used to store it on DVD in the first
place.

Query - Is the file possible corrupt and if so how do I fix it?

Possibly by purchasing a PST recovery program. There are plenty, but you
can find one he http://www.officerecovery.com/
--
Brian Tillman