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Format of VDISK header block (at beginning of INT 19 handler's segment)

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Offset Size Description

00h

18 BYTEs

n/a (for VDISK.SYS, the device driver header)

12h

11 BYTEs

signature string "VDISK Vn.m" for VDISK.SYS version n.m

1Dh

15 BYTEs

n/a

2Ch

3 BYTEs

linear address of first byte of available extended memory