Location: Options > Advanced > Image creation mode
You can use these parameters to create an exact copy of your whole partitions or hard disks, and not only the sectors that contain data. For example, this can be useful when you want to back up a partition or disk containing an operating system that is not supported by Acronis True Image. Please note that this mode increases processing time and usually results in a larger image file.
This check box is available only when the Back up sector-by-sector check box is selected.