I suggest you to backup all your data before proceeding with the below steps. See the post on how to format a USB drive or external disk for Mac for more details. The USB drive should also be formatted in OS X Extended (Journaled) with partition map scheme as GUID. Also backup your data from the USB dive before converting it to recovery USB drive. Though the recovery partition will use only 650MB but I suggest you making the partition size to 1.5 GB or 2 GB as it also needs room for some hidden system and temporary files otherwise you can just use a whole 4 GB USB drive for the process. If you have a USB drive larger than 1 GB, you can create a 1.5 GB or 2 GB partition for the recovery drive because the creation process will erase the whole USB drive and use all of the available space no matter how large it is and the drive will become unusable for data storing purposes. To create your own Mac OS X recovery USB drive, all you need is a 1GB or larger USB drive. What do you need to create Mac OS X recovery USB drive? This emergency disk (OS X Recovery USB Drive) can help you repair the hard disk and save your data. If your computer freezes or crashes more often during boot or does not start at all.If your Mac’s internal drive was cloned and the Recovery partition wasn’t copied in the process.Your Mac’s internal hard drive or Recovery partition is damaged, removed or altered you can still boot from OS X Recovery USB drive. ![]()
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