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Int 21/AX=7304h - Windows95 - FAT32 - Set DPB TO USE FOR FORMATTING -
AX = 7304h
DL = drive number (00h=default, 01h=A:, etc.)
CX = size of buffer (must be at least 18h)
ES:DI - buffer for Set_DPBforFormat structure (see #01790)
Return: CF clear if successful
ES:DI buffer updated
CF set on error
AX = error code (18h = bad length in CX)
SeeAlso: AX=7302h,AX=7303h,AX=7305h
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<h2>Int 21/AX=7304h
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<h3><font color=#C00040>Windows95 - FAT32 - Set DPB TO USE FOR FORMATTING</font></h3>
<PRE>
AX = 7304h
DL = drive number (00h=default, 01h=A:, etc.)
CX = size of buffer (must be at least 18h)
ES:DI -> buffer for Set_DPBforFormat structure <a href="rb-3228.htm#Table1790" tppabs="http://www.ctyme.com/intr/rb-3228.htm#Table1790">(see #01790)</a><br>
<p><b>Return:</b><br>CF clear if successful
ES:DI buffer updated
CF set on error
AX = error code (18h = bad length in CX)
</PRE>
<p><b>See Also:</b>
<a href="rb-3226.htm" tppabs="http://www.ctyme.com/intr/rb-3226.htm">AX=7302h</a> - <a href="rb-3227.htm" tppabs="http://www.ctyme.com/intr/rb-3227.htm">AX=7303h</a> - <a href="rb-3229.htm" tppabs="http://www.ctyme.com/intr/rb-3229.htm">AX=7305h</a>
<PRE>
<p>
Format of Set_DPBforFormat structure:
<a name=table1790></a>
Offset Size Description (Table 01790)
00h WORD (call) size
02h WORD (call) structure version??? (0000h)
(ret) ???
04h DWORD (call) function number
00h invalidate DPB counts
01h rebuild DPB from BPB
02h force media change (next access to drive rebuild DPB)
03h get/set active FAT number and mirroring
04h get/set root directory cluster number
---function 00h---
08h DWORD new DPB free count (00000000h=no change, FFFFFFFFh=unknown)
0Ch DWORD new DPB next-free (00000000h=no change, FFFFFFFFh=unknown)
10h DWORD unused
14h DWORD unused
---function 01h---
08h DWORD unused???
0Ch DWORD (call) -> BIOS Parameter Block from which to rebuild DPB
10h DWORD unused
14h DWORD unused
---function 02h---
08h DWORD unused
0Ch DWORD unused
10h DWORD unused
14h DWORD unused
---function 03h---
08h DWORD (call) new active FAT/mirroring state, or FFFFFFFFh to get
<p><b>bits 3-0:</b><br>The 0-based FAT number of the active FAT
<p><b>bits 6-4:</b><br>Reserved (0)
<p><b>bit 7:</b><br>Do not mirror active FAT to inactive FATs
0Ch DWORD (ret) previous active FAT/mirroring state (as above)
10h DWORD unused
14h DWORD unused
---function 04h---
08h DWORD (call) new root directory cluster number
FFFFFFFFh to get current
0Ch DWORD (ret) previous root directory cluster number
10h DWORD unused
14h DWORD unused
</PRE>
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