Block allocation map

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Here, the View BAM utility on the Commodore 1541 Test/Demo Disk is displaying a portion of the block allocation map for that disk.
Here, the View BAM utility on the Commodore 1541 Test/Demo Disk is displaying a portion of the block allocation map for that disk.

In computer file systems, a block allocation map (BAM) is a data structure used to track the allocated or freed disk blocks.

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