Files to CDI ?!?

[GL]

Well as far as i know Crazy Taxi is not self-bootable.
In that case, what you tried should work (with the boot-disc of course), I can tell cause it worked out for me earlier with succes.
Anyway, if the game is self-bootable, it means there's more than one session then what you tried would have failed because you have to had made use of the exact same session layout, which gets lost when you transfer the files to yer HD.
The solution is use discjuggler to make a .cdi, keeps the layout intact.

-cheers