Hidden System Files and MS-DOS 5 and Later Upgrade (74589)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q74589
The Microsoft MS-DOS Upgrade Setup copies the hidden system files IO.SYS
and MSDOS.SYS to the front of the root directory in the boot drive. If the
previous version of DOS had files called IO.SYS and MSDOS.SYS created by
Microsoft, those files will be deleted.
If the previous version of DOS has hidden system files by other names
or that were not created by Microsoft, they are moved to the first
available space in the root directory of the bootable hard drive.
These files can then be deleted after resetting the file attributes.
The following command will turn off the system file attribute, the
hidden file attribute, and the read-only file attribute of a file
attrib -s -h -r ibmbio.com
These files can also be deleted using MS-DOS Shell.
| Modification Type:
|| Last Reviewed: