I'm using OS X 10.5.8., updated from 10.5.2. which I installed from the two installation DVDs that came with my MB404 MacBook.

I recently found my original 10.5.2. installation DVDs, which I thought I had lost. So I want to save them as image files on my backup drive in .iso format (since I normally use Windows).

I created .iso files from the DVDs in Disk Utility (> New Image > Image Format DVD/CD master > Save, then later renamed the .cdr file to .iso).

When I create an image from my DVD "Mac OS X Install Disc 1", it (as expected) creates an image called "Mac OS X Install Disc 1.iso":

enter image description here

But when I inspect this .iso file with 7zip later, I notice that the image file contains a parent folder with the same name as the image file, i.e. a folder "Mac OS X Install Disc 1":

enter image description here

Inside this folder there are a range of folders and files pertaining to the installation of Mac OS:

enter image description here

This is not what I expected to find. I expected to see what you see in the third picture here directly when I looked inside the .iso file. But for all I know, that is how .dmg image files are and are supposed to be.

The reason I am asking is this: If I burn this .iso image file to a DVD, will it be bootable on a Mac computer?


I tried what Gordon suggested. It seems counterintuitive to me to burn an image of the DVD drive and not the DVD disc, but I gave it a try.

My resulting .cdr file now looks somewhat different from the .iso file discussed above - at first sight.

The file is now a MacOSX1052Disc1.cdr file:

enter image description here

Its content is different from the .iso file. The content looks like this:

enter image description here

I see that there is an Mac_OS_X.hfs file here. HFS is basically an Apple image format. Opening this file reveals the identical content of the .iso file discussed above:

enter image description here enter image description here

In other words, my initial concern with the .iso file was that the content seemed to be inside the parent folder rather than at the top of the file hierarchy. Using Gordon's suggested approach, however, the content in question is buried even further down the hierarchy. I doubt, therefore, that this is the right approach to take here.

1 Answer 1


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 did as you suggested, cf. my updated question.
    – Sverre
    Apr 23, 2013 at 14:06
  • I'm leery of 7zip's display format -- the Apple partition map is not a "file" (at least in the normal sense), and there's no way that I can think of that Disk Utility's imaging process could turn it into one. The format of the disk is weird, so I can see 7zip getting confused by it. I'd try burning the image to a DVD-R with Disk Utility and testing that, and if that works try to figure out to to burn it from Windows. Apr 23, 2013 at 22:17
  • But my aim is not to burn an image made on a Mac to a DVD using Mac (I already have the original DVD anyway). My aim is to make an image that I can save on a hard drive in Windows, and then make a bootable DVD from it whenever I want. So yes, it's exactly "try to figure out to to burn it from Windows" that I am asking for ...
    – Sverre
    Apr 24, 2013 at 11:15

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