Awhile back I bought a 500 GB Seagate FreeAgent Go external hard drive to backup my 218 GB PC. I used the automatic backup software that came with it and it works fine. After all this I purchased a MacBook Pro and now, instead of buying another drive and also considering there's plenty of space on the one I already have, I was wondering if I could possibly partition half the drive to be used as a backup with Time Machine without touching the other half. I plugged in the drive to my Mac and opened Disk Utility. It says it is a NTFS file system (I suppose that's normal). Anyways, is this possible and if so can someone guide me through it? Thanks. Btw, I just found this Mac forums site. It's great.