Hi, I have a mac book pro, 120 GB, 60 GB is a PC, 60 GB is the mac. I do not have the original CD, but I've purchased the snow leopard one. The problem is that if I put the snow leopard disk it just upgrades my current OS. I want to: - reformat my HD completely as I'm selling the laptop and install snow leopard - leave a partition of 40 GB for the PC (install this later) I've seen posts that speak about disk utilities, however, in my case, the erase options are greyed out, so this is not an option. Also the posts that I've seen seem to require the original CD - which as mentioned, I don't have, I just have the new snow leopard one - which should be ok for the job? Thank you so much!