sentences:  Most commercial imaging software is "user-friendly" and "automatic" but may not create bit-identical images.These programs have most of the same advantages, except that they may allow restoring to partitions of a different size or file-allocation size, and thus may "not" put files on the same exact sector.Additionally, if they do not support Windows Vista, they may slightly move or realign partitions and thus make Vista unbootable (see Windows Vista startup process).