I need to make a sector by sector mountable image file of a USB drive that will allow recovery of deleted files. I'm not looking to simply put every file into a DMG. Will the DMG created by Disk Utility copy all sectors, including empty ones? I've searched extensively and what I'm finding is a lot of posters on various forums saying to use DD or a program like Carbon Copy Cloner, which doesn't even allow you to create a sector-by-sector image file, only copy sectors from one disk to another. I've used DD before on Linux systems but I'd like to avoid it if a GUI tool does the same thing.