fsck error: currently, only 1 or 2 FATs are supported, not 34

"When you do a dosfsck you need to tell it what partition number - fsck's launching of dosfsck isn't quite cutting it in this case (maybe). Try running dosfsck directly:

sudo dosfsck -r -v /dev/sdb1

the -r option is for interactively fixing the file system

the -v option is for verbosity

If you still see the error, I suspect the filesystem is corrupted. The File system is indicating you have 34 file allocation tables, which is not possible - you'll need to reformat."