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<TITLE>Int 21/AX=7303h
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Int 21/AX=7303h - Windows95 - FAT32 - GET EXTENDED FREE SPACE ON DRIVE -
AX = 7303h
DS:DX - ASCIZ string for drive (C:\ or \\SERVER\Share)
ES:DI - buffer for extended free space structure (see #01789)
CX = length of buffer for extended free space
Return: CF clear if successful
ES:DI buffer filled
CF set on error
AX = error code
Notes: on DOS versions which do not support the FAT32 calls, this function
returns CF clear/AL=00h (which is the DOS v1+ method for reporting
">
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<h2>Int 21/AX=7303h
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<h3><font color=#C00040>Windows95 - FAT32 - GET EXTENDED FREE SPACE ON DRIVE</font></h3>
<PRE>
AX = 7303h
DS:DX -> ASCIZ string for drive ("C:\" or "\\SERVER\Share")
ES:DI -> buffer for extended free space structure <a href="rb-3227.htm#Table1789" tppabs="http://www.ctyme.com/intr/rb-3227.htm#Table1789">(see #01789)</a>
CX = length of buffer for extended free space<br>
<p><b>Return:</b><br>CF clear if successful
ES:DI buffer filled
CF set on error
AX = error code
</PRE>
<p><b>Notes:</b>
On DOS versions which do not support the FAT32 calls, this function
returns CF clear/AL=00h (which is the DOS v1+ method for reporting
unimplemented functions).
Under DOS 7.x (i.e. "MSDOS Mode" under Windows95), the ASCIZ string
pointed at by DS:DX *must* include the drive letter, or this function
will return CF set/AX=0015h (invalid drive). In a DOS box, omitting
the drive letter (DS:DX -> "\") results in the free space for the
current default drive, as expected
<p><b>BUG:</b>
This function returns a maximum of 2GB free space even on an FAT32
partition larger than 2GB under some versions of Win95 and Win98,
apparently by limiting the number of reported free clusters to no
more than 64K -- but only in a DOS window if a TSR has hooked INT 21h
<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-3228.htm" tppabs="http://www.ctyme.com/intr/rb-3228.htm">AX=7304h</a> - <a href="rb-3229.htm" tppabs="http://www.ctyme.com/intr/rb-3229.htm">AX=7305h</a> - <a href="rb-2751.htm" tppabs="http://www.ctyme.com/intr/rb-2751.htm">AH=36h</a>
<PRE>
<p>
Format of extended free space structure:
<a name=table1789></a>
Offset Size Description (Table 01789)
00h WORD (ret) size of returned structure
02h WORD (call) structure version (0000h)
(ret) actual structure version (0000h)
04h DWORD number of sectors per cluster (with adjustment for compression)
08h DWORD number of bytes per sector
0Ch DWORD number of available clusters
10h DWORD total number of clusters on the drive
14h DWORD number of physical sectors available on the drive, without
adjustment for compression
18h DWORD total number of physical sectors on the drive, without
adjustment for compression
1Ch DWORD number of available allocation units, without adjustment
for compression
20h DWORD total allocation units, without adjustment for compression
24h 8 BYTEs reserved
</PRE>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
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