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- Plug in your external drive to your Mac.
- Open Disk Utility.app from /Applications/Utilities/
- As indicated by Circle #1, select the top level of your USB drive's listing in the left window pane.
- Press Command+I or press the "Get Info" button to see the window on the right side of the above graphic
- As indicated by Circle #2, make note of the contents to the right of the "Disk Identifier" field. You will need it in a following step.
- If you haven't already, copy the Netboot DMG to a location on your computer that you can access.
- Open Terminal.app from /Applications/Utilities/
Type the following command, replacing the fields indicated:
Info title Code sudo dd if=/path/to/netboot-file.dmg of=/dev/disk-identifier-here bs=1m
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Example: sudo dd if=/Users/override/Desktop/Restore-9.82-TTSMACDEPLOYM-(15C50).dmg of=/dev/disk3 bs=1m
In the above command, "if" indicates "input file" (i.e. the Netboot DMG) and "of" indicates "output file" (i.e. the USB drive).
IMPORTANT! Re-read your above syntax to make sure you have entered the correct "of" device identifier, or else you could accidentally wipe a drive you need!
After you have checked your syntax, press "Return" and then enter the account password that is currently logged in.
- The process will run silently until it either completes successfully or fails with an error. The usual time to copy the DMG file is between 10-15mins.
- If you complete successfully, then eject the external drive through Disk Utility or by dragging the drive to the Trash.
- To test, insert the external drive into a computer that is powered off. Hold the "Alt/Option" key, and then power the computer on. If you were successful, you should see an orange-colored volume with the name "TTS-Netboot-9.xx" (e.g. TTS-NetBoot-9.82.nbi). Click the arrow below this volume to begin the boot process to resume booting using the selected boot device.
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This portion of the procedure is optional and only recommended for advanced users. Once you have verified that your external drive boots correctly, you can create a local package cache on the bootable drive that Casper Imaging can use instead of using a network Distribution Point. This option can be useful if the computer to be imaged does not have network access or lacks sufficient bandwidth to make Netboot imaging practical. The drawback to this method is that the package repo must be continually refreshed in order to stay up-to-date.
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