I get a lot of errors while booting from the CD on my new PC, while the same CD works fine on my laptop. So the CD must be OK (md5 checksum was OK too).

First, the following errors occur hundreds of time:
ide: failed opcode was: unknown
hda: drive not ready for command
hda: ATAPI reset complete
hda: status error: status=0x58 {DriveReady SeekComplete DataRequest}
etc...

At the end, the process stops with the following:
cloop: read error at pos xxx in file /cdrom/KNOPPIX/KNOPPIX, 28814 bytes lost
cloop: error - 3 uncompressing block xxx
kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block {1,3}

What might be the problem here?

Help is very much appreciated!

Bas.