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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text-html; charset=Windows-1252">
<title>INT 21,32 - Get Pointer to Drive Parameter Table
(Undocumented)</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_1920"></a>INT 21,32 - Get Pointer to
Drive Parameter Table (Undocumented)</h1>
<p> AH = 32h</p>
<p> DL = drive (0=default, 1=A:, 2=B:, 3=C:, ...)</p>
<p> on return:</p>
<p> AL = FF if the drive number in DL was invalid</p>
<p> DS:BX = address of drive parameter table (~DPT~)</p>
<p> - available since DOS 2.0</p>
<p> - used by DOS commands CHKDSK and RECOVER</p>
<p> - forces a media check, which clears byte DS:[BX+17h] or
DS:[BX+18h]</p>
<p> in the Drive Parameter Table</p>
<p> - actually accesses the disk, causing a critical error if a
disk</p>
<p> error occurs</p>
<p> - can be used to determine if a drive is SUBST'ed by
comparing</p>
<p> DS:[BX+1] and DS:[BX] for a match. If not equal, then the</p>
<p> drive is possibly SUBST'ed (though not guaranteed, this may
also</p>
<p> indicate a Bernoulli box)</p>
<p> - can be used to determine if a drive is a RAM disk; if the
disk is</p>
<p> NOT removable and (DS:[BX+1] == 0), then the disk is a RAM
disk</p>
<p> (see ~IOCTL,0~ bit number 0Bh to determine if the disk is
removable)</p>
<hr>
<table border="0" width="100%" cols="3">
<tr>
<td width="33%">Zur<EFBFBD>ck zum <a href="inte1at0.htm">Interrupt
Info</a>. </td>
<td align="center" width="33%"><a
href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
/ 1998 </td>
<td align="right" width="33%"><font size="1">L.<2E>nderung <!--webbot
bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
startspan -->29.03.99<!--webbot bot="Timestamp" endspan
i-checksum="13964" --> </font></td>
</tr>
</table>
</body>
</html>