If it’s missing, redownload it from the App Store by selecting Apple menu > App Store. (Check in your Applications folder.) Even if you previously had this utility, it may no longer be on your drive, because OS X unhelpfully deletes it after you use it. In some cases, an Assistant-created drive will work only with the Mac that made it. Luckily, you have another way to create an emergency flash drive.įirst, you need a copy of the Install OS X Mountain Lion app. The do-it-yourself method: Lacking the Recovery HD partition on your startup drive isn’t the only reason you might skip using Apple’s Recovery Disk Assistant. Connect your USB flash drive to your Mac, launch OS X Recovery Disk Assistant, select the drive, and then follow the on-screen prompts. If the partition is missing or corrupt, you’ll see an error.ĭownload the OS X Recovery Disk Assistant from Apple’s Support site. Why do you have to have a partition on your Mac to be able to create the emergency drive on an external device? It’s probably because Disk Assistant requires the data on the partition to create the external drive. You can’t create an emergency flash drive using Apple’s Recovery Disk Assistant unless your Mac already includes a Recovery HD partition.
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