Not the usual installation media check failures

[Mark]

I everyone,

I have a weird problem with the media check of the FC5 disks:

All checksums are ok. I burned the ISOs and run media checks on them on one computer. 2 disks fail.
I run the media check again on another computer and one of the disks that failed on the first machine passes, however another disk
that passed on the first machine fails on the second machine.

I used ide=nodma on both machines.

Any idea why?
Should I just go ahead and ignore this and install anyway?

Thanks,

MARK