199 lines
13 KiB
HTML
199 lines
13 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 26
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 26 - -
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INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions 32M)
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AL = drive number (00h = A:, 01h = B:, etc)
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CX = number of sectors to write (not FFFFh)
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DX = starting logical sector number (0000h - highest sector on drive)
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DS:BX - data to write
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Return: CF clear if successful
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CF set on error
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AH = status (see #02547)
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AL = error code (same as passed to INT 24 in DI)
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AX = 0207h if more than 64K sectors on drive -- use new-style call
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">
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<META NAME="robots" CONTENT="none">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 26
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</h2>
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</center><p>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040></font></h3>
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<PRE>
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INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M)
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AL = drive number (00h = A:, 01h = B:, etc)
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CX = number of sectors to write (not FFFFh)
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DX = starting logical sector number (0000h - highest sector on drive)
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DS:BX -> data to write<br>
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<p><b>Return:</b><br>CF clear if successful
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CF set on error
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AH = status <a href="rb-4113.htm#Table2547" tppabs="http://www.ctyme.com/intr/rb-4113.htm#Table2547">(see #02547)</a>
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AL = error code (same as passed to INT 24 in DI)
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AX = 0207h if more than 64K sectors on drive -- use new-style call
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may destroy all other registers except segment registers
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</PRE>
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<p><b>Notes:</b>
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Original flags are left on stack, and must be popped by caller.
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This call bypasses the DOS filesystem, though DOS 5+ invalidates any
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disk buffers referencing sectors which are written with this call.
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Examination of CPWIN386.CPL indicates that if this call fails with
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error 0408h on an old-style (<32M) call, one should retry the
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call with the high bit of the drive number in AL set.
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Novell DOS 7 decides whether the old-style or new-style (>32M) version
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of INT 26 must be used solely on the basis of the partition's size,
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thus forcing use of the new-style call even for data in the first
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32M of the partition.
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Windows98 will display an error message and deliberately hang the
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system on attempted write to any hard disk if neither bit 7 of the
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Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h)
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is set.
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Although all registers except segment registers may be destroyed
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some software depends on some of the registers being preserved.
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For example some Flash disk drivers requires that DX is not trashed.
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DR-DOS 7.03 takes care of this.
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<p><b>BUGS:</b>
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DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
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invalid drive number.
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DR DOS 3.41 will return with a jump instead of RETF, leaving the
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wrong number of bytes on the stack; use the huge-partition version
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(INT 26/CX=FFFFh) for all partition sizes under DR DOS 3.41.
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DR DOS 6.0 original releases 05/1991 & 08/1991 reported wrong error
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codes for "drive not ready" and "write protect". This was fixed
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<PRE>
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<p><b>with the DR DOS BDOS patch "PAT321" (1992/02/19, XDIR /C:</b><br>947Bh)
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and later "full" rebuilds (see INT21/AX=4452h for details).
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</PRE>
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<p><b>See Also:</b>
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<a href="rb-0608.htm" tppabs="http://www.ctyme.com/intr/rb-0608.htm">INT 13/AH=03h</a> - <a href="rb-4113.htm" tppabs="http://www.ctyme.com/intr/rb-4113.htm">INT 25</a> - <a href="rb-4118.htm" tppabs="http://www.ctyme.com/intr/rb-4118.htm">INT 26/CX=FFFFh</a> - <a href="rb-3229.htm" tppabs="http://www.ctyme.com/intr/rb-3229.htm">INT
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<p>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
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DOS Kernel</a>
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- <a href="int-26.htm" tppabs="http://www.ctyme.com/intr/int-26.htm">
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Int 26h</a>
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- <a href="alpha-@.htm" tppabs="http://www.ctyme.com/intr/alpha-@.htm">
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@</a>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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</td></table><p>
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