A big thank you paul for your amazing site, I used it to link to to the DVD HACKS page in hope rather than expection to make my DAEWOO DF-450P DVD/VHS recorder region free. Every DVD player (that includes the one in your computer) is sold being able to play only discs with the same region as the country it was sold in. That includes Macs too, sort of. On a new Mac, the DVD drive is automatically locked to the DVD region code that is first used. From then on, this can only be changed four more times.
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I think there are some bad assumptions here. '/dev/rdisk' needs to define the number for the physical drive starting with '0' (ie. /dev/rdisk0, /dev/rdisk1, etc).The 'list disks' command lists all of the volumes connected to the computer. I have 4 hard drives totalling 16 volumes (partitions). And I have a server connected. All 17 of those get counted individually by 'list disks' and the result is '/dev/rdisk16' which means the external DVD drive would be counted as '/dev/rdisk17' when it gets connected.
But, the 4 physical hard drives really occupy '/dev/rdisk0' thru '/dev/rdisk3' and the connected server does not use a '/dev/rdisk' mount point. So, in theory, when the external DVD drive get connected, it would occupy '/dev/rdisk4'.
Make Mac Region Freezer
But what if you put a DVD into the external drive but don't immediately play it? And then later you plug in another drive, say a thumb flash drive. The flash drive now becomes the last device after the external DVD drive. On my system, the DVD drive would be '/dev/rdisk4' and the flash drive would be '/dev/rdisk5'. So, you then run the script, and even if the 'list disks' command actually worked the way you were thinking it would, the script would then return '/dev/rdisk5' for the DVD drive even though it is really '/dev/rdisk4'. You cannot assume that the DVD drive is always the last device in the chain.
Make Mac Region Freeze
You need to find a more clever way to detect the real virtual device number for the DVD drive.