PLZ HELP! my cdclone-copies only work on my computer. is this NORMAL?

[buk]

dear friends,
i manage to do 1on1-copies of nearly every game, using CLONECD and my RICOH 7080A, firmware 1.10. so i was quite happy, until i tried to install those copies on a friends computer (just to check out, if they work), and none of them did work. i tried them even on some other friends computerss, and always failed.
i always use the correct read and write options, and as said, for me they work fine, even if i run them from my normal cd-drive.

is this NORMAL?

thx for answering,
buk