Hey, I want to get an external hard disk to go with my iMac G5, either 160GB or 240GB as it is mainly just for backing up music and video files in case of the Mac being damaged or stolen etc. Do most of the external hard disks work with Macs, and do they require compatiable software, or is it just a case of plugging in through the USB/Firewire and its ready to go? Sorry for the dumb questions but I am new to this bit of the Mac world! Can also anyone in the UK recommend a good reliable quality make that is available through amazon or one of the PC world like online stores? I dont need anything fancy as it will be used just for backup only, but with the huge number of makes that come up when searching external hard disk through amazon, I dont know where to begin, so if anyone could help that would be really appreciated!