Craig Cohen (via Clark Goble): Yosemite uses a volume format known as Core Storage. It is the enabling technology behind Fusion Drive and FileVault. Core Storage is a reliable, high-performance volume format. It provides increased crash protection, ditto blocks for metadata, copy-on-write B-tree catalogs, in-place transformations for backgrounding the disk encryption used by FileVault, and … Continue reading Yosemite’s Switch to Core Storage