SPARSE
type virtual disks use a hierarchical representation to organize sectors. See
Virtual Disk Format 5.0 referenced
in
Virtual Disk Internal Format. In this context, grain means
granular unit of data, larger than a sector. The hierarchy includes:
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Grain directory (and redundant grain
directory) whose entries point to grain tables.
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Grain tables (and redundant grain tables)
whose entries point to grains.
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Each grain is a
block of sectors containing virtual disk data. Default size is 128 sectors or
64KB.
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