Hello, Ok so I bought myself a new iMac back in late october and it came with Tiger installed and a Leopard install disc in the box. Not a big deal... it did take a little while to install but it didn't bother me. So my question to you mac experts is this, First off I am buying an old PowerBook and want to throw leopard on that, and my friend's HDD crashed and we need to reinstall leopard on it as well ( of corse he lost his install discs lol) and don't forget I already used one install originally on my new iMac. How many installs do you get with those drop-in discs? THANKS!!!