Mac partition map

Apple Partition Map (APM) is a partition scheme used to define the low-level organization of data on disks formatted for use with 68k and PowerPC Macintosh computers. It was introduced with the Macintosh. The Apple partition map is unusual in that it defines itself as one of the partitions on the disk, and it defines free space as a partition in the map as well. This means that every block on the disk (with the exception of the first block, block 0) belongs to a partition.


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