How to Create an Msdos.sys File Larger Than 1024 Bytes

• Microsoft Windows 95
• Microsoft Windows 98

SUMMARY

Some programs expect the Msdos.sys file to be at least 1024 bytes in length. If it is not, these programs may not work correctly. For example, if an anti-virus program detects that the Msdos.sys file is less than 1024 bytes in length, the program may assume that the Msdos.sys file is infected with a virus.

If you use the SYS command to transfer system files from your Windows Startup disk to the hard disk, the Msdos.sys file that is copied to the hard disk is less than 1024 bytes in length. This article describes how to create an Msdos.sys file that is at least 1024 bytes in length.

MORE INFORMATION

To create an Msdos.sys file that is at least 1024 bytes in length, follow these steps:

1. At a command prompt, type the following lines, pressing ENTER after each line:
   
   C:\>attrib -s -h -r c:\msdos.sys
   C:\>edit c:\msdos.sys
   C:\>



2. Add the following lines to the Msdos.sys file

   
      [Paths]
      WinDir=<Windows>
      WinBootDir=<Windows>
      HostWinBootDrv=C
   
      [Options]
      BootGUI=1
      ;
      ;Some programs on this system expect the Msdos.sys file to be at least
      ;1024 bytes in length; hence, the following lines create an Msdos.sys
      ;file that is greater than 1024 bytes in length. These lines are not
      ;needed for Windows to boot or run.
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxa
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxb
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxc
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxd
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxe
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxf
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxg
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxh
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxi
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxj
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxk
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxl
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxm
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxn
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxo
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxp
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxq
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxr
      ;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxs
    

   where <Windows> is the folder containing Windows (for example, C:\Windows). If you are using disk compression software (such as DriveSpace), change the letter in the "HostWinBootDrv=" line to the letter of the host drive.
   
   You must add the lines with all the Xs to make the Msdos.sys file at least 1024 bytes in length.



3. Save the Msdos.sys file and then exit Edit.com



4. Type the following line, and then press ENTER:
   
   C:\>attrib +s +h +r c:\msdos.sys
   



5. Restart your computer.

Keywords          : kbenv win95 winboot win98 
Version           : 95
Platform          : WINDOWS 
Issue type        : kbhowto 

Last Reviewed: January 16, 1999