Today I am going to provide a helpful guide to recover broken USB drives, ghost drives, and drives unable to be formatted. Check out Ben’s comment in particular about Chip Genius, the tool is very useful to ascertain what controllers/NAND you are working with. As some commenters have mentioned there are better ways of going about recovering Flash drives at this point. Beware of following this guide on modern systems.
EDIT: This information is very out of date at this point.
