I'm still only a prospective user of ATI, but I would like to know a few things about the Disk Clone tool. Does it copy sector-by-sector or file-by-file or is there a choice between the two? If sector-by-sector, then two further questions: 1. Does it exclude from the copy disk space which is not allocated to files? 2. If it includes unallocated space in the copy, will the copy fail if the target disk's total size is even a few bytes smaller than the source disk's total size, even if the source disk is mostly empty? If file-by-file, one further question: does ATI have some way to overcome the problem (under Vista, at least) when you try to copy a bunch of system files using Windows' own file-copying methods: many of the files are being written by Windows and cannot be copied. Thanks for any info.