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How can I achieve this from either macOS Catalina or Windows 10? I can't seem to find a guide online. I've downloaded Mac OS X Snow Leopard Install DVD from the Internet Archive. Keep in mind that this is an .iso file, not .dmg.

I don't need a full step-by-step guide, just need to know how to format the drive (MBR/GPT?) and how to copy the .iso file to it.

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  • What OS are you running that you'll perform the necessary operations from? – user3439894 Sep 1 '20 at 18:25
  • I've downloaded the file to a Windows 10 laptop but I can transfer it to a Macbook running Catalina, which I assume will make things easier. I'll edit the question. – Cecemel Sep 1 '20 at 18:28
  • Have you tried Googling, e.g. mac os x snow leopard to usb? Have you tried How to Create a Bootable USB Drive With OS X Snow Leopard – user3439894 Sep 1 '20 at 18:43
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    What Mac model are you planning to use this on? – benwiggy Sep 1 '20 at 18:52
  • Are you trying to create an installer drive (one you can use to install Snow Leopard on some other disk), or a drive with an installed copy of Snow Leopard (that you can boot from and run normally -- sort of like a live CD)? – Gordon Davisson Sep 1 '20 at 20:36
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Creating a USB Flash Drive Installer from a Snow Leopard ISO File

This was tested using an iMac (21.5-inch, Mid 2011) 2.5 GHz Intel Core i5 with MacOS High Sierra 10.13.6 installed. The procedure should be the same for Catalina. The flash drive needs to be at least 8 GB in size. The Snow Leopard ISO file was the same as discussed in this answer, which should be the same ISO you have linked to in your question.

  1. Use the Finder application to mount the Snow Leopard ISO file.

  2. Use the Disk Utility application to erase the flash drive, as shown below. I chose the default name Untitled. Finally, click on the Erase button.

    x1

  3. Highlight the name Untitled, then click on the Restore button on the top of the Disk Utility application window. In the popup window, select restore from Mac OS X Install DVD, as shown below. Finally, click on the Restore button in the popup window.

    x3

Using the Command Line Interface (CLI)

Note: This flashdrive will be using the Apple Partition Map scheme. This differs from the flash drive created using the Disk Utility, which used the Master Boot Record scheme. In other words, there is more than one way to create a USB flash drive installer from a Snow Leopard ISO file.

The steps below are for OS X and macOS.

  1. Use the command given below to determine the identifier for the flash drive.

    diskutil list
    
  2. Enter the commands given below to create the USB flash drive installer. Here, an assumption is made that the ISO file name is snow leopard install.iso and the file resides in your Downloads folder. Also, an assumption is made that the identifier is disk2. If necessary, make the appropriate substitutions.

    DISK=disk2
    diskutil unmountdisk $DISK
    sudo dd if="$HOME/Downloads/snow leopard install.iso" of=/dev/r$DISK bs=1m
    

The steps below are for Linux.

  1. Use the command given below to determine the name for the flash drive.

    lsblk
    
  2. Enter the command given below to determine if any volumes on the flash drive are mounted. If there are mounted volumes, then use the sudo unmount command to unmount them before proceeding. Here, an assumption is made that the name for the flash drive is sdb. If necessary, make the appropriate substitutions in the rest of the steps.

    mount | grep /dev/sdb
    
  3. Enter the command given below to create the USB flash drive installer. Here, an assumption is made that the ISO file name is snow leopard install.iso and the file resides in your Downloads folder. If necessary, make the appropriate substitutions.

    sudo dd if="$HOME/Downloads/snow leopard install.iso" of=/dev/sdb bs=1M
    

 

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I couldn't find a method that worked as Disk Utility doesn't cooperate with OS 10.6 .dmg or .iso files, the instructions above might work on older versions of macOS, but I couldn't get it to work on Big Sur. But then I discovered that the same method I've been using to create bootable linux thumb drives works with the 10.6 .iso AND .dmg (depending on which one you have), and it's way easier and works on any operating system (mac/windows/linux).

  1. download balenaEtcher - https://www.balena.io/etcher/
  2. Install and run, choose your .iso/.dmg file. A warning will pop up about how it's missing a partition table (the same reason DiskUtility refuses to flash it), but you can simply click continue. Then select your USB drive and flash.
  3. Wait for the process to finish and you're done, super easy. I had no issues booting into the installer on my old 2008 MacBook (for those who don't know how, just plug in your USB stick and restart your Mac while holding the option key).

Be sure to use a standard installation DVD .dmg or .iso, some of these are copied from the "grey" disk, which means they're attached to a specific machine and won't allow you to install even though you can still boot into it successfully.

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