Ok, this time is about "Formating Hard Disk". I have a 500GB west degital hard disk. It was used for time machine, however, it only comes with a usb 2.0 and no firewire that cuz the speed of tranfer rate are quite low. So, I decide to use it to back up my video collection. Here is the problem, I devieded this hard disk into 3 Hard Disk Partition which can only be read by mac. but some of my videos are stored in my pc, which I also want them can be back up. The Question is, can I only fromating ONE partition of this hard disk without have any issue? Thanks in advance.