I have a MacBook with a Momentus XT hybrid SSD+HDD drive. It have a 500GB HDD plus 4GB SSD which, as I could check, it uses as a cache for read operations. It uses some kind of black magic to determine the most used data and let it easily accessible through the SSD storage.
I wonder if I can enable FileVault 2 to encrypt this drive and if it will kill these feature of the hybrid drive.
I know that FileVault always lead to a performance penalty, but my wonder is if the drive will become unable to determine the portion of data that can be SSD-boosted due to the fact that it will become encrypted.