Why is my USB drive read only on Ubuntu only?

Question

I formatted a USB flash drive as FAT in Ubuntu, copied some files, made it bootable, and now it only mounts as read-only.

If I stick the same drive in Windows or Mac, it is writable, so it's not the hardware switch on the drive itself.

• How do I make this permanently mount as writable.
• What could have caused this bizarre behavior (so it doesn't happen again)?

Answer 1

No idea what was the cause. Reformatted (from Linux) and all works well now.

Answer 2

Double check the file system on the device (preferably chkdsk in Windows, or dosfschk under *nix). It would also help to see the output of #mount so we can see how the filesystem is mounted. You could also try this:

sudo umount /path/to/device
sudo mount -t <type> -w /path/to/device /mount/path