I bought a SanDisk USB drive about a month ago. It's currently formatted as MS-DOS (Fat32), and it's stuck on read-only and I'm not sure how to fix it. (and there is no physical switch on the usb) In particular, under 'Sharing & Permissions' of 'Get Info' it just says 'You can only read'.
Using Disk Utility I tried 'First Aid', which failed:
I also tried 'Erase', which also failed:
Then I tried 'Erase' on the disk, didn't work either:
I've also tried a no. of commands in terminal:
diskutil eraseDisk free EMPTY /dev/disk2 >> Unable to begin erase operation: A writable disk is required (-69772)
diskutil unmountDisk force /dev/disk2 diskutil eraseVolume free free /dev/disk2 >> Error: -69888: Couldn't unmount disk
sudo dd if=/dev/zero of=/dev/disk2 bs=1024 count=1024 >> dd: /dev/disk2: Permission denied