The BootSect is one-sector long (512 bytes).  It is located 31 sectors
after the end of the MDFAT; its location can be obtained from the
wMdResSects field (offset 27H) of the MdBpbRec.

It is identical to a standard Boot Sector, as it would exist for a
physical drive of the (estimated) disk size except that it does NOT
necessarily contain any executable boot code.  It exists as part of the
DoubleSpace "simulation" of a real disk.

One Boot Sector field bears mention:  the bFatCnt (offset 10H) contains
02H, even though the CVF does not maintain a duplicate of the FAT.  When
programs request a sector which would be part of the second FAT,
DoubleSpace returns a sector from the "first" (only) FAT.

See Also: CVF Layout
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CVF Region: BootSect