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<TITLE>Int 21/AX=4409h
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Int 21/AX=4409h - DOS 3.1+ - IOCTL - CHECK IF BLOCK DEVICE REMOTE -
AX = 4409h
BL = drive number (00h = default, 01h = A:, etc)
Return: CF clear if successful
DX = device attribute word
bit 15: drive is SUBSTituted
bit 13: (DR DOS 3.41/5.0 local drives only) always set
media ID needed
bit 12: drive is remote
bit 9: direct I/O not allowed
CF set on error
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<h2>Int 21/AX=4409h
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<h3><font color=#C00040>DOS 3.1+ - IOCTL - CHECK IF BLOCK DEVICE REMOTE</font></h3>
<PRE>
AX = 4409h
BL = drive number (00h = default, 01h = A:, etc)<br>
<p><b>Return:</b><br>CF clear if successful
DX = device attribute word
<p><b>bit 15:</b><br>Drive is SUBSTituted
<p><b>bit 13:</b><br>(DR DOS 3.41/5.0 local drives only) always set
media ID needed
<p><b>bit 12:</b><br>Drive is remote
<p><b>bit 9:</b><br>Direct I/O not allowed.
CF set on error
AX = error code (01h,0Fh,15h) <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)
</PRE>
<p><b>Notes:</b>
On local drives, DX bits not listed above are the attribute word from
the device driver header <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 #01646 at AH=52h); for remote drives,
the other bits appear to be undefined for MS-DOS versions prior to
5.0 (they are all cleared in DOS 5+).
Checking whether DX=0800h on return appears to be a fairly reliable
method for detecting Microsoft's RAMDRIVE, though not for other
ramdisks (there appears to be no simple yet foolproof method for
detecting ramdisks, although the presence of only a single copy of
the FAT and only a single head on non-removable devices is a fairly
good indicator); for Windows95, RAMDRIVE returns DX=4800h.
For non-existent remote drives, this function sometimes returns
AX=0015h (drive not ready) instead of AX=000Fh (invalid drive) on
the first call; a subsequent call will return the correct error
code.
This function was not supported by Digital Research's DOS Plus
<p><b>See Also:</b>
<a href="rb-2820.htm" tppabs="http://www.ctyme.com/intr/rb-2820.htm">AX=4400h</a> - <a href="rb-2890.htm" tppabs="http://www.ctyme.com/intr/rb-2890.htm">AX=4408h</a> - <a href="rb-2892.htm" tppabs="http://www.ctyme.com/intr/rb-2892.htm">AX=440Ah</a> - <a href="rb-4411.htm" tppabs="http://www.ctyme.com/intr/rb-4411.htm">INT 2F/AX=122B
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DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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