Problem fixing my corrupted USB drive on OS X I followed your tutorial How do I fix a corrupted USB drive on OS X?
and got the final message:


  dd: /dev/disk2: Permission denied


Then I tried it with a sudo command and got the message:


  dd: /dev/disk2: Resource busy


Do you have an idea how I can successfully fix my corrupted USB drive?
You need to unmount the disk first. Before you can write to it using ddHere the command you need to run to unmount the disk:

sudo diskutil unmount /dev/disk2