Disk

DOS 时代的磁盘编辑程序，1999 年用 x86 汇编写成。全屏文本界面，直接读写硬盘的 MBR、引导记录、FAT、根目录和数据区，十六进制与文本双栏编辑。

DISK v1.0   Copyright (c) Zhang Weidong, 1999-2000   NO:1999-0701

源码只有一份：Disk.asm，约 2900 行，未改动地保存下来。这是 Fun 语言作者 （张卫东，笔名一了，Wisdom ZHANG）学生时代的早期作品。

---

中文说明

它是什么

在 Windows 之前、在大部分磁盘工具都还要收费的年代，用汇编直接和 BIOS 打交道 写的一个磁盘编辑器。装上 DOSBox 就能跑。

界面是一套仿 Turbo Vision 的菜单：

菜单	菜单项
File	Save Disk / Load Disk / Save CMOS / Load CMOS / Exit
View	MBR / Reserve / Boot / Fat 1st / Fat Copy / Root / Data Start / Sector / LSector
Edit	Edit / Save
Search	DIR / FileName / String / Next
Drive	A: / B: / C: / Other Wise
Option	Extra: 1C / Extra: 2C
Help	How About

• View 直接跳到分区表（MBR）、保留扇区、引导记录、两份 FAT、根目录、数据起始 扇区，按物理扇区或逻辑扇区定位。
• Edit 在十六进制区和文本区同步编辑扇区内容，Save 写回磁盘。
• Search 支持按目录、文件名、字符串查找，Next 继续下一处。
• Drive 在 A: / B: / C: 之间切换，另外两个选项走扩展位置。
• 参数栏实时显示柱面 C、磁头 H、扇区 S、逻辑盘 LD、逻辑簇 LC、逻辑扇区 LS。
• File 菜单可以把整个磁盘或 CMOS 存成映像、再读回来。

技术实现

• 16 位实模式，两段式（Code / Data，均 segment para），org 100h。
• 底层中断：
  • INT 10h（BIOS 显示，19 处）画字符界面；
  • INT 13h（BIOS 磁盘）做原始扇区读写；
  • INT 16h 读键盘；
  • INT 21h 少量 DOS 调用。
• 分区表 / BPB 各字段自己解析（PPPP、LDisk、PtoL、LtoP 等过程）， 柱面、磁头、扇区、逻辑簇之间互相换算。
• 约 60 个过程，从 DispPage、Box 这类绘制例程，到 GetHex、Disp2Hex 这类十六进制输入输出，再到 Read/Write/LRead 的扇区 I/O。

编译与运行

需要 MASM 或 TASM（DOS 下或 DOSBox 里）：

masm Disk.asm;
link Disk.obj;
exe2bin Disk.exe Disk.com
Disk.com

或者 TASM：

tasm Disk.asm
tlink /t Disk
Disk.com

只能跑在 16 位实模式环境（纯 DOS 或 DOSBox）。直接读写扇区，别在装了重要数据的 机器上乱按；要试就拿软盘或磁盘映像试。

版权

Copyright (c) Zhang Weidong, 1999-2000, All rights reserved. 源码作为历史存档公开，请自行斟酌用途。

---

English

A disk editor for DOS, written in x86 assembly in 1999. Full-screen text UI, reading and writing raw disk sectors: MBR, boot record, both FATs, root directory and the data area, with side-by-side hex and text editing.

The whole thing is one file, Disk.asm, about 2900 lines, preserved unchanged. An early work by the author of the Fun programming language (张卫东 / Wisdom ZHANG, pen name 一了).

What it does

A Turbo Vision-like menu bar:

Menu	Items
File	Save Disk / Load Disk / Save CMOS / Load CMOS / Exit
View	MBR / Reserve / Boot / Fat 1st / Fat Copy / Root / Data Start / Sector / LSector
Edit	Edit / Save
Search	DIR / FileName / String / Next
Drive	A: / B: / C: / Other Wise
Option	Extra: 1C / Extra: 2C
Help	How About

• View jumps straight to the partition table (MBR), reserved sectors, boot record, both FAT copies, root directory and the data start, addressed by physical or logical sector.
• Edit edits a sector in a synchronized hex / text view; Save writes it back.
• Search finds by directory, filename or string; Next continues.
• Drive switches between A: / B: / C: plus two extras.
• A parameter bar shows cylinder C, head H, sector S, logical drive LD, logical cluster LC and logical sector LS in real time.
• The File menu saves the whole disk or the CMOS settings to an image and loads them back.

How it is built

• 16-bit real mode, two para segments (Code / Data), org 100h.
• Interrupts: INT 10h (BIOS video, 19 calls) for the text UI; INT 13h (BIOS disk) for raw sector I/O; INT 16h for the keyboard; a few INT 21h DOS calls.
• Parses the partition table and BPB by hand (PPPP, LDisk, PtoL, LtoP and friends), converting between cylinder / head / sector / logical cluster.
• About 60 procedures, from drawing routines (DispPage, Box) to hex I/O (GetHex, Disp2Hex) to sector I/O (Read / Write / LRead).

Build and run

MASM or TASM, under DOS or in DOSBox:

masm Disk.asm;
link Disk.obj;
exe2bin Disk.exe Disk.com
Disk.com

or

tasm Disk.asm
tlink /t Disk
Disk.com

It runs in 16-bit real mode only (plain DOS or DOSBox). It writes raw sectors, so do not point it at a machine you care about; try it on a floppy or a disk image.

License

Copyright (c) Zhang Weidong, 1999-2000, All rights reserved. Published as a historical archive; use at your own discretion.