So the image file was 90GB? How many GB are shown as "used" in the partition's properties? On my Windows 7 computer, the C partition is 95GB, of which about 42GB are used. But that includes the paging file, which is 8GB, so the net used is 34GB. The image file for that is about 19GB after compression, and the image creation process to a Western Digital Passport USB3 drive takes about 25 minutes. I was hoping Windows 10 would be similar, but it appears to be far larger than 7.