i just bought my parents the new 17in imac, to replace an old windows machine i built like 3 years ago.....so far everyone loves it...my dad needs to use a PC for work though, so he has a thinkpad, and he decided that he really needs to back up his laptop before something bad happens. he also wants to back up the imac as well, so he is in the market for an external HD.....since i use macs, ive used lacie drives, but i know they arent the friendliest with PCS, you have to DL macdrive for it, and that costs money etc.......so i want to know if its possible for me to share an external HD between the 2 machines simultaneously, and back both computers up to it.....i know that the format for the drives b/t macs and pcs are different (HFS+ i believe?)......there are usually 2 firewire ports on the back of most external Hd's (lacie's at least), so does that mean i can share it b/t 2 computers at the same time? i know how to use backup for mac, but is there a comporable free program for windows that lets me backup prefs and stuff automatically whenever i designate it to? thanks a lot guys