Hi!
5-Мар-2004 19:31 [EMAIL PROTECTED] (Eric Auer) wrote to
[EMAIL PROTECTED]:
EA> Hi Arkady, for FAT32 drives, WinDOS returns on int 21.32 (get BPB),
EA> when you use it as "get default BPB", that:
EA> - root dir size would be 512 entries
EA> - FAT1x size would be as FAT32 size
What if FAT size will be > 32M?
EA> - so you have to notice "aha, FAT so big that it must be FAT32" and
EA> use the FAT32 call then. Or even better, try the FAT32 call FIRST
EA> and if it fails because it is not FAT32, try int 21.32
INT21/7302? [BTW, FreeDOS doesn't expects at [ES:DI].word0 "length of
data", but RBIL says that this field is for "call" only. Who wrong?]
EA> FORMAT already contains a workaround for that.
Before I continue to SYS, I now develop boot sector checking utility.
Currently it works with FAT12/FAT16:
______________O\_/_________________________________\_/O______________
DPB:
Drive, media ID : D: (#1), F8h
Bytes/sector : 512
Sectors/cluster : 16 (2**4)
FAT start, size : 1, 255 * 2
Root start, entries : 511, 512
Data start, clusters : 543, 50667
BOOTCHK: warning: 198 FAT sectors is enough
Valid.
BPB:
Bytes/sector : 512
Sectors/cluster : 16
FAT start, size : 1, 255 * 2
Root entries : 512
Total sectors : 0, 811215
Hidden sectors : 0
Tracks, heads : 63, 15
Media ID : F8h
BOOTCHK: warning: no extended boot signature
BOOTCHK: warning: 198 FAT sectors is enough
Valid.
_____________________________________________________________________
O/~\ /~\O
Next I add support for FAT32, then re-export some checks into SYS back.
Unfortunately, I have no FAT32 for checks. Anyone?
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