FileVault requires Recovery HD partition in OS X
FileVault, in OS X Lion and later, is part of a volume management technology called CoreStorage, which includes a full-disk encryption option that functions underneath the operating system, allowing it to be transparent to the operating system’s functions and encrypt all data on the drive. This is a convenient way to secure OS X, but in order to work, it does need to have an unencrypted section of the drive that it uses to store the encryption keys for unlocking the drive.
Any drive encrypted with FileVault will have a small hidden partition that contains these keys, and for the boot drive…
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