Have tried using Disk Utility to make a DVD-DL of a Mac OSX install disc. No luck creating a bootable disc. The CDR discs do not boot. The DVD brought up a black screen. Have read that I might need to try several times? Am using Verbatim DVD+R DL media Trying Leopard and Snow Leopard retail discs. I was able to create a bootable partition on an external, perhaps I need to try to burn that to a DVD. Method that produced a disc that did not boot. 1. Open Disk Utility 2. Highlight "Mac OS X Install DVD" on the left 3. Click "Create New Image" 4. I name the file "Mac OS X Install DVD" and I select the options of Image Format "DVD/CD Master" and Encryption "None" 5. I click save 6. When the image is finished I eject the install DVD. 7. I then insert a blank Dual Layer DVD 8. I go back to Disk Utility 9. I highlight the Mac OS X Install DVD image 10. I click Burn. Method that produced a disc that brought up a black screen. Making a DVD Image: Step 1. Insert the retail Mac OS X Install DVD into your drive. Step 2. Launch Disk Utility (Applications > Utilities). Step 3. In Disk Utility, you will notice a white pane on the left hand side. In the pane, select the Mac OS X Install DVD by clicking on it once. Step 4. Click New Image on the Disk Utility toolbar. Step 5. A dialog box will appear. Give the new image a name. I used 'Mac OS X Install DVD'. Select the destination where you wish to save it. Leave Image Format at Compressed (default) and Encryption at None (default). Step 6. Click Save to begin creating the image. Step 7. Once your image has been created DO NOT mount it. Leave the image alone and proceed to the next section. Burning the Image: Step 1. Launch Disk Utility (Applications > Utilities). Step 2. Click Burn on the Disk Utility toolbar (upper left). Step 3. Navigate to where you saved the DVD image created in the previous section. Click on the image file, then click the Burn button. Do not drag and drop the image file into Disk Utility during this step. Step4. Insert a DVD when prompted and proceed to Burn it.