I recently fixed my friends computer, and installed Ubuntu 13.10 on to it.
To do this, I used my flash-drive (he had no disc reader). However, now I want to undo what I did to the flash drive.
I created the drive on Mac OSX following the official websites instructions to create the flash drive. I have already formatted the drive in windows, but now it's only 2.7 MB big.
How can I un-Ubuntu the drive? I'd really like to not have to buy a new one.
EDIT: Instructions on how to do this on EITHER OS (Mac or Windows) are good. I don't have access to the Ubuntu machine any longer. (sadface again)