Create Your Own Mac Recovery HD on Any Drive
You can create the Recovery HD clone on any volume listed in Disk Utility, but the cloning process will erase any data on the destination volume. For this reason, it’s a good idea to resize and add a partition dedicated to the new Recovery HD volume you are about to create. The Recovery HD partition can be very small; 650 MB is the minimum size, although I would make it slightly larger. Disk Utility probably won’t be able to create a partition that small, so just use the smallest size it can create.
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