Fran, from the way it sounded, he was having a problem with the drive, not the disks. I believe the disks are just fine, but the drive may be dirty or just worn out.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)