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).
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Mac OS X Hints By Rob Griffiths Jan 4, 2008 6:32 am PST In 10.5, the region capture screenshot tool—that’s Shift-Command-4, which turns your cursor into a draggable crosshair—has learned.

Regions Mac Os Catalina

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'.

Mac

Macbook aluminum, Mac OS X (10.5.6) Posted on Feb 16, 2009 12:39 PM. Region control is considered a form of digital rights management, albeit a fairly simple one. Dec 18, 2020 What is a MAC and what do they do? A Medicare Administrative Contractor (MAC) is a private health care insurer that has been awarded a geographic jurisdiction to process Medicare Part A and Part B (A/B) medical claims or Durable Medical Equipment (DME) claims for Medicare Fee-For-Service (FFS) beneficiaries. What Region X does is allows you to reset OS X’s region change counter, so after you’ve switched back and forth between Regions 1 and 3 four times and your Mac tells you that no further chances are permitted, you can go into Region X and just reset the counter back to 4. Installing the upcoming macOS 11.3 software update on an M1 Mac may result in Rosetta 2 being removed in one or more regions around the world.

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.

You need to find a more clever way to detect the real virtual device number for the DVD drive.


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This will not work all the time. It depends on the drive in your computer. Some drives work fine doing this, some (MATSHITA in particular) won't let VLC run if the region code isn't set properly on the drive. And guess what drive ends up in portable, moving around, and traveling laptops?? (>_<)

I can't say anything about all ibook/powerbooks but my ibook (1ghz 12') works fine with VLC and non-US region dvds. I purchase asian dvds a great deal, and not all of them are region 1 or 0. It is confirmed to have a mashita drive as well.

I have no problem with foreign DVDs on VLC on either my dual G5, my mactel box, nor my powerbook.

Definitely doesn't work on my iBook with a Matshita CD-RW CW-8124 normally set for region 2.
I just tried it with a region 1 disk and while VLC briefly sees the title of the disk, it just stops without displaying an error. Opening the log window shows it just can't access the files on the disk so it finaly fails (cleanly) on a 'nothing to play' message.
FWIW while I was at it I also tried a DVD ripping app called 'HandBrake' (who thinks up names like these?) and it failed with 'no valid titles found'.
I don't think anything can be done without changing the firmware on that drive. Unfortunately last time I looked around it didn't seem to be possible for this specific model.

The Matshita CW-8124 also won't override region encoding on a PC for the same reason. There are two simple solutions, but neither is free. You can add an external DVD drive that can be flashed or over-ridden (Any Pioneer brand will do), or replace the Matshita drive with a notebook version of the Pioneer (DVR-K05).

There might be a solution to that. Sometimes I stick the disc in and force quit the DVD player -- but the DVD disappears from the Finder menu.
VLC has an File >> Open Disc feature. There are several options (it will even let you access the DVD menus!) and I recommend leaving it at the default and selecting OK.
I have a first generation macmini with the Matsushita CD-RW/DVD reader combo.
Hope that helps,
N
---
Flip Out: http://filebox.vt.edu/org/tkd/

BIOS?
Mac's have open firmware, but not a BIOS.
The usual way to get a region free drive is to make it RPC-1 by flashing THE DEVICE'S firmware, not the computers.
This is only complicated as most of the firmware flashers are os9 based, and that's now legacy - well that and the drives Apple use now are hard to get the firmware off to patch to make RPC-1

Sheesh. I'm slightly tired of mr. Know-it-alls hammering this line.
Let's see what Open Firmware does:
Interfaces components of the computer with one another, and the user.
Boots everything.
Basically handles Basic Input and Output, as a System.
Why, you might as well make an acronym out of that. Something like... BIOS! That's right, it's the same fsckinging thing. In fact, another word for BIOS is, as you'd expect it, 'firmware'.
Same
Fscking
Thing.
Sheesh, some morons...

That's it! If you kids don't stop arguing, I will turn this iMac around. We will go right back to PPCland, and you will NOT get to see IntelWorld. Do you want that?!
Stop the fussing. Mr. Know-it-all is just arguing semantics. OpenFirmware is indeed a BIOS by definition.
However, in popular language, OpenFirmware is the Mac BIOS, and 'BIOS' is the PC screen you can only get to by hitting Del at startup. Or F1. Or Enter. Or whatever the manufacturer chooses.
Now sit down. We've got another seven hours until we get to the hotel, and I am NOT stopping at another rest area!

Just going by the definition of firmware in the wikipedia!
http://en.wikipedia.org/wiki/Firmware
but hey - you obv. know better than the thousands of authors of the wikepedia.
signed
mr. know-nothing

Technically, Open Firmware is a type of BIOS. It's a 'Basic Input Output System'. See this link for more details: http://www.openfirmware.org/

From Wikipedia:
'BIOS, in computing, stands for basic input/output system. BIOS refers to the software code run by a computer when first powered on. The primary function of BIOS is to prepare the machine so other software programs stored on various media (such as hard drives, floppies, and CDs) can load, execute, and assume control of the computer....BIOS is sometimes called firmware because it is an integral part of the system hardware....In addition, plug-in adapter cards such as SCSI, RAID, Network interface cards, and video boards often include their own BIOS, complementing or replacing the system BIOS code for the given component.'

When I said reflash the BIOS, I meant the BIOS of the CD-ROM drive, although I'll admit that firmware is the more usual name... however, regardless of what we call it, we can (I believe) all agree it's hard, and getting harder, to do in Mac OS X (I spent quite a while trying to find a way of fiddling this in hardware on my ibook, and couldn't ever find something to do it which I trusted enough to install..)

You also can set the region code of a DVD to 0 (or anything, actually) using MacTheRipper.

Isn't that a workaround? Don't you then have to rip and burn the DVD to get it to work? I think the parent was trying to play the original discs.

It's still kind of a workaround, but you don't have to burn it back to DVD. You can play the DVD directly from your hard drive with VLC once you've ripped it with MacTheRipper.

Or open the VIDEO_TS folder in DVD Player for playback after ripping with MTR if you don't want to use VLC.

but if you can't read the DVD to begin with, MactheRipper is of no use.
(as is the case on my dual G5)

Indeed. :-)

Not only that, but VLC ignores copy protection. I copied a DVD with disk utility, but it didn't work in my DVD player (just became a garbled). When I put it in my Mac, DVD player told me that the copy protection was wrong or something. I opened it in VLC and it played fine.