In Mac OS X v10.4 (Tiger), FileVault stores the encrypted file system as a Sparse Disk Image, which is basically a single large file. In Mac OS X v10.5 (Leopard), FileVault stores the encrypted file system as a new image called a Sparse bundle.[1] Sparse bundles break images into smaller 8MB files c
FileVault - Wikipedia
sparsebundleをゴミ箱から削… - Apple コミュニティ
Review: Time Capsule
