I recently cannibalized the fully operational disk drive from a banged up older KN 2000 and used it to replace the damaged disk drive in my other "newer" KN 2000. However, the newly installed drive no longer recognizes the data on my set up disks. I get a message indiating that the disk was created "for another unit". They loaded and played perfectly in both drives prior to the switch. Why wont they do so now??? Does exchanging a drive affect the way it reads data on the disks???

Thoughts?