If using the provided Snow Leopard installation DVD, or optical media in general to reinstall OS X isn’t an option, using Disk Utility is a much faster, reliable, and compatible method of doing so.
Currently, optical media (CD’s, DVD’s, etc.) are extremely fickle regarding when they choose to work. They scratch often, break easily, and are prone to corruption. Personally, I’ve gone through countless DVDs just to try to successfully boot from one. Most of the time, it didn’t work.
Lastly, for those who don’t have an optical drive, or have a malfunctioning one, using optical media simply isn’t even an option.


I install VirtualBox 5.8 on Windows 10. And I want to install the macOS Mountain Lion on the VirtualBox virtual machine. When the installation process comes to the screen that said select the disk where you want to install the OS X, I can not get the disk to install, how to fix this issue. Nov 29, 2017 STEP 3. Install older OS X onto an external drive. The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. Enter your Apple ID. Found the answer: Open disk utility in the installer b. Highlight your target hard drive for the Mavericks installation in left column. Click Partition tab d. Click Current and choose 1 Partition e. Choose GUID Partition Method g. Under Name: type Mavericks (You can rename it later) h.


  • 1. A Snow Leopard installation .dmg image (essentially a carbon copy of what comes on the Snow Leopard Install DVD)
  • 2. An existing, bootable Mac partition on your computer

Wallet-friendly Note: No need to buy anything!

Warning: Remember to back up all your files before reinstalling.

1. If you haven’t already done so, follow this guide to create your .dmg image of the Snow Leopard Installation DVD

2. Once you have the DMG, right-click it and select “Open With”. By default, OS X opens DMG files with “DiskImageMounter”, which allows you to view the files inside of it. Instead, select “Disk Utility”. If Disk Utility isn’t one of the options in “Open With”, select “Other”. Navigate to /Applications/Utilities/Disk Utility, and select that there.

3. In the left pane of Disk Utility, which displays all the drives connected to your computer, select the encompassing drive containing “Macintosh HD”.

4. Once you select the disk, click the “Partitions” tab. Select “Macintosh HD”

5. The “Partitions” tab displays all the volumes, or different sections of the physical hard drive in your Mac. Click the ‘plus’ box below the Volume Scheme, which will create a new partition.

6. Click the new partition, which will probably be named “Macintosh HD 2”. For logic’s sake, change the name to “Mac Installation”. Confirm that the format for the new partition is “Mac OS Extended (Journaled)” and click “Apply”.

7. Wait for Disk Utility to finish partitioning and verifying the new volume. It may take anywhere from 30 seconds, to 3-4 minutes. Be patient.

8. Once it’s completed, select the volume “Mac Installation” that was just created and click on the “Restore” tab.

9. Find the “Mac OS X Snow Leopard Install DVD.dmg” in the left pane, and drag and drop it into the “Source” field of the “Mac Installation” Restore tab.

10. Find the “Mac Installation” volume in the left pane, and drag and drop it into the “Destination” field.

11. Check “Erase Destination”

12. Click “Restore”

13. While it’s copying the contents of the Snow Leopard Installation image onto the new partition, sit back and relax. The difficult part’s over. This may take about 10-20 minutes depending on your Mac’s speed.

14. Shut down your Mac.

15. Press the Power button, then immediately hold down the “Option” key until a gallery of bootable volumes show up. Using the arrow keys, highlight “Mac Installation” and hit enter.

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16. When it’s finished booting up, select your language (probably English), press Next, and select Utilities -> Disk Utility in the menu bar.

17. It will pull up the familiar application once again. Find “Macintosh HD” in the left pane and click the “Erase” tab.

18. Confirm that the format is “Mac OS Extended (Journaled). Change the name to “Macintosh HD” and press “Erase”. Confirm.

19. Once complete, quit Disk Utility from the menu bar. Or, use (CMD+Q)

20. It will take you back to the Installer. Follow the onscreen instructions. When prompted to select which drive to install OS X onto, select “Macintosh HD”. Proceed with installation.

21. Once installation is complete, which will take a good half hour, your Mac will automatically reboot into your new partition.

22. Once in, open Disk Utility one last time, find the hard drive containing “Macintosh HD” and “Mac Installation” and select the “Partitions” tab. Select the volume “Macintosh Install”, and click the little minus box below the Volume Scheme to remove the partition. Confirm.

23. To reclaim the now empty space, drag the bottom-right hand corner of the “Macintosh HD” partition all the way down. Click “Apply”.

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24. Don’t worry. No more steps apply.

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This method can also be used to install a bootable copy of OS X onto an external hard drive, just by creating the partitions and copying the .DMG onto the external drive instead of the internal drive.