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<TITLE>Int 21/AX=440Dh/CX=086Ah
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Int 21/AX=440Dh/CX=086Ah - MS-DOS 7.0+ - GENERIC IOCTL - UNLOCK LOGICAL VOLUME -
AX = 440Dh
CX = 086Ah / 486Ah
(category code 08h for FAT12/16, 48h for FAT32; minor code 6Ah)
BL = drive number (00h=default,01h=A:,etc)
Return: CF set on error
AX = error code (01h,02h,etc.) (see #01680 at AH=59h/BX=0000h)
CF clear if successful
Note: the logical volume must be locked before direct disk accesses via
INT 13 are permitted by Windows95
BUG: Windows98 will return an error (invalid function) if the specified
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<h2>Int 21/AX=440Dh/CX=086Ah
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<h3><font color=#C00040>MS-DOS 7.0+ - GENERIC IOCTL - UNLOCK LOGICAL VOLUME</font></h3>
<PRE>
AX = 440Dh
CX = 086Ah / 486Ah
(category code 08h for FAT12/16, 48h for FAT32; minor code 6Ah)
BL = drive number (00h=default,01h=A:,etc)<br>
<p><b>Return:</b><br>CF set on error
AX = error code (01h,02h,etc.) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
CF clear if successful
</PRE>
<p><b>Note:</b>
The logical volume must be locked before direct disk accesses via
INT 13 are permitted by Windows95
<p><b>BUG:</b>
Windows98 will return an error (invalid function) if the specified
drive number is zero or more than 32, but only allocated 26 bytes
for recording locks, so BL=1Bh..20h will trash internal data
structures
<p><b>See Also:</b>
<a href="rb-2896.htm" tppabs="http://www.ctyme.com/intr/rb-2896.htm">AX=440Dh"DOS 3.2+"</a> - <a href="rb-2897.htm" tppabs="http://www.ctyme.com/intr/rb-2897.htm">AX=440Dh/CX=084Ah</a> - <a href="rb-2900.htm" tppabs="http://www.ctyme.com/intr/rb-2900.htm">AX=440Dh/CX=086Bh</a>
<p>
<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
- <a href="alpha-m.htm" tppabs="http://www.ctyme.com/intr/alpha-m.htm">
M</a>
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