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.
To create an Msdos.sys file that is at least 1024 bytes in length, follow
- At a command prompt, type the following lines, pressing ENTER after
attrib -s -h -r c:\msdos.sys
- Add the following lines to the Msdos.sys file,
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.
;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.
- Save the Msdos.sys file, and then exit Edit.com.
- Type the following line, and then press ENTER:
attrib +s +h +r c:\msdos.sys
- Restart your computer.
For additional information about how to determine which folder Windows is installed in, click the following article number to view the article in the Microsoft Knowledge Base:
How to determine which folder Windows is installed in
Article ID: 129998 - Last Review: January 12, 2015 - Revision: 2.0
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