Format of Get_ExtDPB data buffer |
| Offset | Size | Description | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
00h |
24 BYTEs |
standard DOS 4+ DPB | |||||||||
18h |
BYTE |
"dpb_flags" (undocumented) FFh force media check |
|||||||||
19h |
DWORD |
pointer to next DPB (see note) | |||||||||
1Dh |
WORD |
cluster at which to start search for free space when writing, usually the last cluster allocated | |||||||||
1Fh |
WORD |
number of free clusters on drive, FFFFh = unknown | |||||||||
21h |
WORD |
high word of free cluster count | |||||||||
23h |
WORD |
active FAT/mirroring
|
|||||||||
25h |
WORD |
sector number of file system information sector, or FFFFh for none (see also #01788) | |||||||||
27h |
WORD |
sector number of backup boot sector, or FFFFh for none | |||||||||
29h |
DWORD |
first sector number of the first cluster | |||||||||
2Dh |
DWORD |
maximum cluster number | |||||||||
31h |
DWORD |
number of sectors occupied by FAT | |||||||||
35h |
DWORD |
cluster number of start of root directory | |||||||||
39h |
DWORD |
cluster number at which to start searching for free space |
|
Note: |
Except for offset 18h, all of the first 33 bytes are identical to the standard DOS 4-6 DPB. |
|
See Also: |