EXPERT RESPONSE
You should see if your external drive is mounted as read-only. You can do this by typing 'mount' from a terminal and checking the status of the drive. The last column should tell you the read/write status the file system is mounted as. The command (rw) indicates read/write and (ro) indicates read-only.
Another possibility is the file system type you are trying to mount. If it is NTFS you are trying to mount, then the kernel you are using may not be compiled with NTFS-write support.
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