Format of SFS control data packet |
| Offset | Size | Description | ||||||
|---|---|---|---|---|---|---|---|---|
|
00h |
WORD |
signature 4330h ('C0') | ||||||
|
02h |
WORD |
function (see #01542) | ||||||
|
---function 00h--- |
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|
04h |
WORD |
sector size in bytes | ||||||
|
06h |
BYTE |
sectors per cluster | ||||||
|
07h |
WORD |
number of boot sectors | ||||||
|
09h |
BYTE |
number of copies of FAT | ||||||
|
0Ah |
WORD |
size of root directory in entries | ||||||
|
0Ch |
WORD |
number of sectors on disk, 16-bit | ||||||
|
0Eh |
BYTE |
media descriptor byte | ||||||
|
0Fh |
WORD |
sectors per FAT | ||||||
|
11h |
WORD |
sectors per track | ||||||
|
13h |
WORD |
number of heads | ||||||
|
15h |
DWORD |
number of hidden sectors | ||||||
|
19h |
DWORD |
number of sectors on disk, 32-bit | ||||||
|
---function 01h--- |
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|
04h |
20 BYTEs |
master IV for encrypted disk | ||||||
|
18h |
64 BYTEs |
NDC/SHS keying information | ||||||
|
---function 02h--- |
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|
04h |
WORD |
read-only state:
|
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|
---function 03h--- |
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|
04h |
WORD |
drive number (see #01544) | ||||||
|
06h |
DWORD |
sector offset of logical volume from start of physical volume 0 if logical volume = physical volume |
||||||
|
---function 04h--- |
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|
04h |
WORD |
mount status
|
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|
---function 05h--- |
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|
04h |
WORD |
hotkey (see #00006)
|
||||||
|
---function 06h--- |
||||||||
|
04h |
WORD |
timeout in minutes before automatic unmount 0000h to disable auto-unmount |
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|
Note: |
The data for function 00h corresponds to a DOS BPB (see
AH=53h). |