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Apple Core Storage (sometimes referred to as coreStorage or CoreStorage) maintains a world of virtual disks that can provide the user with flexibility in allocating their hardware.

Core Storage was introduced with Mac OS X 10.7 (Build 11A511)

In Apple's Mac OS X Developer Library, there is reference to Core Storage under:

What's New In Mac OS X: Mac OS X v10.7 Lion: BSD And Kernel Features: FileVault

FileVault 2 is not the only application of Core Storage. Core Storage is also used for Time Machine encryption of a backup volume; also applicable without encryption.

Expect more information about Core Storage (the verb) to appear after the diskutil(8) Mac OS X Manual Page is updated for 10.7.