I have a toshiba 8MB USB that will not load to the desktop, it flashes green when put in a port but it won't come up not even in disk utility have tried it on a iMac, a Macbook air and a PC
Only 8 MBs?
It sounds old, it could be bad.
Do other USB sticks work, if so it sounds like your USB stick is the problem.
Yes other sticks do work but this was my main go to (guess I'll replace it BUT I really need some of the most recent data - I don't back up every single time I use it, just once a week and I got zapped