HFS+ or Mac OS X Extended is a most widely used and reliable operating system, developed by Apple Inc. for its Mac OS X, series of operating systems. It is the enhanced version of HFS file system and supports larger file names, long length block addresses (32-bit), and Unicode support for naming files and folders. The file system is made up of a number of data structures and all these data structures need to be intact for proper working of your system. In case any damage to any of the data structures, you might come across serious data loss situations and need Mac Data Recovery to be handled.

Among all the HFS+ file system data structures, Allocation File is the most critical one. The Allocation File is responsible to record the allocation block details such as either they are free or in use. There are various sectors that combine to create HFS+ file system volumes and then allocation block, group of one or more than one sectors, is created. The number of allocation blocks could different as per size of the HFS Plus volume.

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