Extract a disk image without diskimagemounter

I'm pretty sure you created the image wrong. When you create the image in Disk Utility, it's very important that you specify the source correctly. I'm not certain I remember exactly right, so you should test this before you trust the results, but here's the process as I remember it:

1. In Disk Utility's sidebar, select the DVD's entry. IIRC, it'll actually list two entries in the sidebar: the DVD itself, and then indented under that the installer volume ("Mac OS X Install DVD" or something like that. You want the DVD entry, not the volume entry under it.

   IIRC older versions of Disk Utility would actually list three entries: the DVD, a session under that, and the volume under that. In this case, I'm pretty sure it's the session (the middle entry) you want.

2. Under the File menu, choose "New" > "Image from disk2" (or whatever the disk ID is). This tells Disk Utility you want a raw device image, not just image the files contained in the disk.

3. In the save dialog, set the Image Format to "DVD/CD master"

I think that procedure will work, but to be sure it's best to rename the file from ".cdr" to ".iso", copy it to your Windows computer, burn it to a DVD-R, and actually try booting the Mac from it. Note that if you mount the .iso on Windows you will not see anything like what you expect -- IIRC the 10.5 install DVDs are actually in a hybrid format that contains a Windows-readable driver disk for Boot Camp, and a Mac-readable (& bootable) installer volume. So if you mount it on Windows, you'll see Windows drivers, not a Mac installer. (BTW, this is also true of the original DVD, so try mounting that on your Windows computer to check my memory.)

I know of two techniques to modify readonly disk images - using either a sparse image or a shadow file. Here is what to do using a shadow file:

Create an image of your cdr (which you have already done)- I will call this xxx.cdr.

Use hdiutil attach xxx.cdr -shadow which mounts the read-only xxx.cdr image along with a shadow file where all changes will kept. So it behaves like a mounted read/write image.

Make your changes.

Unmount the disk - you will now have xxx.cdr and xxx.cdr.shadow

Now run:

hdiutil convert -format UDTO -o newxxx.cdr xxx.cdr -shadow

Then burn the newxxx.cdr to `DVD-R.

This is the method I have used to create a Snow Leopard image for use by Parallels or VMware. My posting in a MacRumors Thread is just part of a long discussion.

You may need to vary the above to suit your particular needs - I have no direct experience of working with PS2 images.