OK, try this.  Be careful though, it’s dangerous.

Unmount the disk, as before.  Now, try wiping out the first megabyte of the 
disk, with a command like this:
dd if=/dev/zero of=/dev/disk3 bs=1m count=1

In that command, disk3 is the hypothetical disk.  Replace it with the real one. 
 Get it right or you lose data!

If it fails, record the reason, and try again with sudo.  If that fails, I’m 
inclined to think you must be looking at write-protection, of some kind or 
another, whether implemented in hardware or not.

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