I recently purchased a USB Hard drive, but it was pre formatted in MAC format, now I use a PC (with windows Xp pro). i tried connecting the hard drive via usb and firewire cable but it just picks up a unknown device and does not appear in my computer or windows explorer. i tried it on my laptop but same thing. now i need to reformat this to windows (NTFS or FAT32) but just don't know where to start, i looked at various internet sites for help with no luck. model: its LAcie D2 triple interface 320GB. if anyone can help please i need to back up my work. Thank you.