Copied from http://..........com/forum/271049-32-500gb-hard-drive-shows-space-comp .1GB according to the disk manufacturers is equal to 1,000,000,000 bytes. According to how the operating system (and the rest of the computing world) calculates it, it's equal to 1,024 megabytes, which in turn are equal to 1,024 kilobytes, which are themselves equal to 1,024 bytes. So one GB as per the disk m...