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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles! A sparse image is a type of disk image file that can be created under Mac OS X using Disk Utility. Encrypted sparse image files are used to secure a user's home directory by Mac OS X's FileVault feature. Unlike a full image file (.dmg), which takes up as much actual space as the real disk it represents (regardless of the amount of unused space), a sparse image file (.sparseimage) takes up only as much actual disk space as the data contained within. This can be advantageous when backing up data. For example, assume a user would like to make a backup of a hard disk volume named INFO that is 5GB in size, yet only contains 2.5GB of actual data. While a single layer DVD-R (with around 4.7GB capacity) would be too small to store a full-sized INFO.dmg image file, an INFO.sparseimage image file will fit. This is because the unused 2.5GB from the original volume is not actually allocated within the sparse image file. The INFO.sparseimage file will occupy only 2.5GB.

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