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Format of SFS data packet

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Offset Size Description

00h

4 BYTEs

signature string "SFS1"

04h

WORD

SFS unit number (0-based)

06h

WORD

drive on which the SFS volume is mounted

08h

DWORD

sector offset of logical volume from start of physical volume
0 if logical volume = physical volume

0Ch

WORD

flag:
00h = no disk mounted
01h = disk mounted

0Eh

WORD

flag:
00h = read/write
01h = read-only

10h

WORD

quick-unmount hotkey (see #00006)
high byte = shift state
low byte = scan code

12h

WORD

auto-unmount time in minutes, or 0000h if already expired, or FFFFh if not set

14h

WORD

time in minutes remaining before auto-unmount

16h

WORD

internal driver check code
0000h = no error
0001h = driver consistency check failed
0002h = unit consistency check failed

18h

WORD

disk access mode
0000h = BIOS
0001h = IDE direct access
0002h = SCSI direct access