Short Story: Made a bootable USB using Pendrive on my PC. Deleted the files on my Mac. Can't be used now on PC, won't reformat on PC Did I destroy the USB? Long Story: I'm learning how to work with Linux for my job and since my mac is older (Macbook Pro 2.2) I decided that's the one that will be the test subject. I used Pendrive to make the USB bootable. The USB was bootable but was never able install Fedora or CentOS, it froze after I selected the iso to boot from. In my defeat I booted OSx and deleted the files on there. When I took the USB back to my PC it wouldn't/ couldn't read the USB. It just wanted to reformat it which it can't. Does anyone know what happened? Did I destroy my USBs?