I just purchased my first Mac, a Powerbook. I also purchased a Seagate 500GB external hard drive. I want to be able to store files from both my PC and my new Powerbook on the drive but I can't figure out how to do so. I was able to transfer some files from my PC to my Powerbook (music and such), but when I hooked it up to the Powerbook, it wouldn't run Time Machine to do a backup.

So, I tried to partition the drive so that half was in FAT for my PC and the other half formatted for the Powerbook. When I hooked the hard drive up to my PC, it wouldn't recognize the drive any more.

So, is there any way to do both so I can back up both my PC and my Powerbook on the same external HD?

Thank you for any help in advance.