DigestI
Sender: jan1 (Spirit), Forum: DOS
Subject: Re: Analysis of MS-DOS Boot Loader
Posted: BBS Tsinghua BBS Station (Thu Sep 11 19:48:24 1997)
【In reply to cq (Seven Virtues Layman)】
: Which expert can post it by the way, thanks a lot. I haven't found the explanation in the books I've read.
The following is a partition structure of a hard disk, divided into one pri and one ext, and the ext contains one logical
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※ Source:·BBS Tsinghua BBS Station bbs.net.tsinghua.edu.cn·
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Subject: Re: Analysis of MS-DOS Boot Loader
Posted: BBS Tsinghua BBS Station (Thu Sep 11 19:48:24 1997)
【In reply to cq (Seven Virtues Layman)】
: Which expert can post it by the way, thanks a lot. I haven't found the explanation in the books I've read.
The following is a partition structure of a hard disk, divided into one pri and one ext, and the ext contains one logical
C:\>debug
-a100
1876:0100 mov ax,201
1876:0103 mov bx,7c00
1876:0106 mov cx,1 ; col 0, sector 1
1876:0109 mov dx,81 ; Second hard disk, head 0
1876:010C int 13
1876:010E int 3
1876:010F
-g=100
AX=0050 BX=7C00 CX=0001 DX=0081 SP=FFEE BP=0000 SI=0000 DI=0000
DS=1876 ES=1876 SS=1876 CS=1876 IP=010E NV UP EI PL NZ NA PO NC
1876:010E CC INT 3
-d7d80
1876:7D80 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7D90 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DA0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DB0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 01 ................
^^ dh for pri-partition
1876:7DC0 01 00 06 3F 60 F3 20 00-00 00 E0 9F 0F 00 00 00 ...?`. .........
^^^^^cx for pri-partition ^^ dh for ext-partition
1876:7DD0 41 F4 05 3F E0 F1 00 A0-0F 00 00 F0 0F 00 00 00 A..?............
^^^^^cx for ext-partition
1876:7DE0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DF0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 55 AA ..............U.
-a106
1876:0106 mov cx,f441 ;
1876:0109
-g=100 ; reading col:sec f441, head 0, this is ext-partition
AX=0050 BX=7C00 CX=F441 DX=0081 SP=FFEE BP=0000 SI=0000 DI=0000
DS=1876 ES=1876 SS=1876 CS=1876 IP=010E NV UP EI PL NZ NA PO NC
1876:010E CC INT 3
-d7d80
1876:7D80 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7D90 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DA0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DB0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 01 ................
^^ dh for logical driver
1876:7DC0 41 F4 06 3F E0 F1 20 00-00 00 E0 EF 0F 00 00 00 A..?.. .........
^^^^^cx for logical driver
1876:7DD0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DE0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DF0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 55 AA ..............U.
--
※ Source:·BBS Tsinghua BBS Station bbs.net.tsinghua.edu.cn·
(Copied using S-Term article copy script)
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=================================
大功告成，打个Kiss!
ko20010214@MSN.com
神州优雅Q300C
Intel CeleronM 370处理器 | 256MbDDR内存
40G硬盘 | USB2.0 | IEEE 1394
13.3 ' WXGA 宽屏(16:10) | COMBO光驱
10/100M网卡 | 四合一读卡器
