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2.2.2.7.6 FPMap (Free Page Map) Page

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The general layout of an FPMap is identical to that of an AMap, except that each bit in the FPMap corresponds to a PMap page, and the value of the bit indicates whether there are any free pages within that PMap page. With each PMap covering about 2 megabytes and an FPMap page at 496 bytes, an FPMap page covers about 8 gigabytes of space.

Implementations SHOULD NOT use FPMaps. The Density List SHOULD be used for location free space.<16> However, the presence of FPMap pages at the correct intervals MUST be preserved, and all corresponding checksums MUST be maintained for a PST file to remain valid.

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