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