Format USB Drive with MAC OS X format:
- Connect USB drive to MAC System:
- Launch Disk Utility from Applications:
- In Disk Utility > Select the newly inserted USB drive in left pane > Choose “Partition” Section
- In “Partition Layout” Select “1 Partition”
- In “Partition Information” > Give it a Name, say “OS X Installer”
- In Format Choose “Mac OS Extended (Journaled)”
- Click on “Options…” and Select “GUID Partition Table”
- On confirmation prompt, click “Partition”
- Once successfully Partitioned, you’ll below screen
- Installing MAC OS X to USB drive:
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Locate “Install Mac OS X Mountain Lion.app” that you have downloaded from Apple Store
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Navigate to folder /Applications/Install Mac OS X Mountain Lion.app/Contents/SharedSupport/InstallESD.dmg
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Launch Disk Utility > Select the USB Drive “OS X Installer” > Select “Restore”
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Drag and Drop “InstallESD.dmg“ to Source and Drag and Drop “OS X Installer” to Destination as shown below
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Click Restore
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Provide Administrator credentials to allow the operation
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Bootable USB drive creation will continue and you’ll see the time estimates and progress in the below of the screen.
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Once successfully created a USB bootable disk you’ll see below window
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Also, verify the amount disk space that is utilized by the installer on USB disk
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