High Quality Content by WIKIPEDIA articles! 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 that was introduced with the Macintosh SE (it can be used on a Macintosh Plus too). Apple disks are divided into logical blocks, with 512 bytes usually belonging to each block. The first block contains an Apple-specific Block0 structure. Because APM allows 32 bits worth of logical blocks, the size of an APM formated disk is limited to 2 TiB. The Apple partition map is unusual in that it defines itself as one of the partitions on the disk. 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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