The main hardware limitation for restoring a system image backup is that the target computer must have at least as many hard drives as the source system, and each drive must be at least as big as its corresponding drive in the source system This means, for example, that you can't restore a system image from a system that has a 500-GB hard drive to a system with a 320-GB hard drive, even if the original system had less than 100 GB of data on its drive. Keep in mind also that, on a system with multiple hard drives, the BIOS determines which one is the bootable drive, and this is the one on which Windows will restore the image of your system volume. (You have no choice in the matter, aside from reconnecting the drives or, if your BIOS permits it, selecting a different bootable drive.)

If your new computer meets the space requirements, restoring a system image should work . This is true even when the source and target computers use different disk controllers, such as SCSI, PATA (IDE), or SATA. Similarly, other differences—such as different graphics cards, audio cards, processors, and so on—shouldn't prevent you from restoring a system image to a different computer. This is because hardware drivers are isolated from the rest of the image information and are rebuilt as part of the restore process

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