Here is the situation that I'm in. I have a SRMBP and want to create a clone of OSX onto an external hard drive. I have an external hard drive that i'm pulling from my old desktop. It's a 320 GB SATA drive that currently has 4 NTFS partitions on it that take up maybe 100 GBs in all. The remainder of the drive is unformatted and unpartitioned. My question is, will I run into any problems creating a clone on this drive (if i use the unformatted an unpartitioned space)? By problems, I mean is there a chance it will mess up and delete/overwrite the NTFS partitions? From reading the websites, they seem to recommend formatting the entire drive and starting from scratch. I would like to be able to keep the 4 NTFS partitions (as it contains XP and my graduate thesis files). At worst, I could just partition the free space and format it as HTFS+ and transfer/copy the more important files until I have graduated.