It is strongly suggested making the destination disk the same size or larger than the source disk. However, Disk Copy also partly supports copy from a larger source disk to a smaller destination disk.
If source disk and destination disk are of the same size, Disk Copy creates an absolutely identical copy. If the source is smaller than the destination, Disk Copy copies only the data that is available on the source. The data is copied from the beginning of the source onto the beginning of the destination disk. The area at the end of the destination disk, which is larger than the source, remains unaffected.
You will get additional unallocated space after copy if the destination disk is bigger than the former one. You can create a new partition or just resize the copied partition to make use of the additional space. It needs a special partition tool to do this, and EaseUS Partition Master is recommended.
If the source disk is bigger than the destination disk, disk copy may or may not succeed. If the last partition's last sector on the source disk is in the range of the destination disk, the disk copy operation will succeed, otherwise, it will fail.
If disk copy succeeds, the data is copied from the beginning of the source to the beginning of the destination disk. The data larger than the destination disk is not copied and is missing from the destination disk.
A Large-to-small copy is suitable if you make sure before copying that all valid or necessary data is in the front part of the source disk and that this area is not larger than the destination disk. This also applies if you have copied a smaller source onto a larger target and if you copy back the unchanged data onto the original disk or onto a destination disk of the corresponding size.
You can not copy a larger dynamic, GPT or unrecognized disk to a smaller destination disk, because a part of dynamic or GPT disk means null.
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