Are Vector 6.0 and Slax both identifying the drive as the same type ?
If possible; try using "dmesg" on both and see what they find.
dmesg |egrep -i 'dvd|cdrom'
If they both find the same hardware. The next place to start looking might be /var/log/messages.
Perhaps running a
tail -f /var/log/messages
while you insert a disk into the drive.
See if that reveals any clues.