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Debug Script for removing partitions

LAST UPDATED: 08 November 2007 18:20:42 -0600

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Using these scripts you are assuming 100% of the risk.  If either of these scripts screw up your system, Don't call or email me as you have been warned!

These scripts WILL render your Hard Drive inaccessible!

The person that gave this script, Sam Lea of Fort Worth, Texas. 

DOS partitions:

Boot to Win98SE startup disk (It is the best OS made boot disk ever) (Don't have one? Download it here on our downloads page!). Type in debug at the A: prompt.

A:/debug (ENTER)

Enter in the following commands:

Blue: what you type in.

Pink: what is displayed on the screen. (DO NOT TYPE THIS IN!)

Black: this is useful information. (DO NOT TYPE THIS IN!)

To delete partitions on a hard drive:

-F 200 L1000 0 (ENTER)

-A CS: 100 (ENTER)

xxxx:0100 MOV AX,301 (ENTER)

xxxx:0103 MOV BX,200 (ENTER)

xxxx:0106 MOV CX,1 (ENTER)

xxxx:0109 MOV DX,80 (ENTER) <---"80" for hd1, "81" for hd2 >

xxxx:010C INT 13 (ENTER)

xxxx:010E INT 20 (ENTER)

xxxx:0110 (ENTER) <-------BLANK LINE "VERY IMPORTANT" >

-G (ENTER)

- (CTRL)-(ALT)-(DEL) to reboot system

Non DOS partitions:

There are two ways to use the following Debug script:

Run Debug and type the Debug commands from the center column of Table 1 at the corresponding Debug prompt. (The left column of the table shows the prompts that are displayed by Debug. You do not need to type the comments in the right column.)

Type the command in the center column of Table 1 into a file using a text editor such as MS-DOS Editor and then use input redirection to feed the resulting file into Debug. For example, if you typed the commands into a file called HDPART.SCR, you would clear your partition table by typing the following at the MS-DOS command prompt and then pressing ENTER:

  Table 1:  Debug Script to Erase Hard-Disk Partition Table
   ----------------------------------------------------------------
      Debug        Enter Debug       Comments
      Prompts      Commands
   ----------------------------------------------------------------
      -            A 100             Assemble from CS:0100.

      nnnn:0100    INT 13            Call interrupt 13.

      nnnn:0102    press the         (nnnn in the segment address).
                   ENTER key

      -            RAX               Replace AX register.

      AX 0000

      :            0301              Write on sector.

      -            RBX               Replace BX register.

      BX 0000

      :            0200              Start from ES:200.

      -            F 200 L 200 0     We want to write zeros.

      -            RCX               Replace CX register.

      CX 0000

      :            0001              Cylinder, 0, sector 1.

      -            RDX               Replace DX register.

      DX 0000

      :            0080              First physical hard disk, head
                                     0. (Substitute 0081 for this
                                     entry if you are clearing the
                                     table on the second physical
                                     hard disk, 0082 if you are
                                     clearing the third physical
                                     hard disk, and so forth).

      -            P                 Proceed (Debug will display
                                     several lines of information).

      -            Q                 Quit Debug.
 

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Last modified: 02/14/08