 Operating System ®
The MS-DOS 6.22 Upgrade is the easy way to increase your hard-disk space. Plus, it offers 
data-protection technology such as DoubleGuard and ScanDisk to safeguard your data! The MS-DOS 
6.22 Upgrade also frees up more memory for your MS-DOS–based applications. What’s more, 
integration of MS-DOS 6.22 with the Microsoft WindowsTM operating system means it’s a must-have 
for users of Windows!

   
Overview
You asked for an MS-DOS operating system that provides an easy way to increase your hard-disk 
space. You asked for more ways to protect your data. You also wanted an easy way to free up more 
memory. And you wanted MS-DOS features you could easily use within Windows.

It’s all yours! Welcome to MS-DOS 6.22: the easy way to increase your disk space—with 
data-protection technology!

MS-DOS 6.22 includes DriveSpaceTM disk-compression utility that lets users expand their hard-disk 
capacity. But we didn’t stop there. DriveSpace comes with DoubleGuard, a technology that provides an 
extra layer of protection for your data. Also featured is ScanDisk, which scans your disk to find and 
repair damage to your data.

The MS-DOS 6.22 Upgrade includes other powerful data-protection tools such as Anti-Virus, Backup, 
and Undelete. And it comes with MemMaker, which automatically optimizes your computer to free up 
more memory.

We also added automatic mounting of compressed floppies and other removable media, SMARTDrive 
caching of CD-ROM drives, quick uncompression of compressed drives, copy-overwrite protection, and 
many other practical features—most available in versions for both MS-DOS and Windows.

Upgrade to MS-DOS 6.22 today. Because your vital data deserves the best!
The easy way to increase your disk space includes data-protection technology!

If your computer is running out of disk space, MS-DOS 6.22 can get you going again. Version 6.22 
comes with the DriveSpace disk-compression utility, which will expand the capacity of your hard disk.

ScanDisk protects your data by repairing a variety of problems on both uncompressed and DriveSpace 
disks. What’s more, we added to DriveSpace an innovative technology to further safeguard your data. 
DriveSpace comes with DoubleGuard, which automatically provides an extra layer of protection for your 
valuable data. We also added ScanDisk, which helps ensure your data is in good working order by 
diagnosing and repairing a variety of problems on both uncompressed and DriveSpace hard disks. 
ScanDisk also checks for physical defects on your disk and, if necessary, moves your data to a safe 
place on the disk. 

MS-DOS 6.22 can also help you free more memory in which to run MS-DOS–based applications. 
Microsoft MS-DOS 6.22 includes MemMaker, a feature that optimizes your machine’s memory by 
loading software into the upper-memory area above 640K. Because MemMaker is so easy to use, it’s a 
quick and simple way to get more memory for your applications!

MemMaker makes it easy to gain more memory for MS-DOS–based applications. Just type memmaker 
at the C prompt, and MS-DOS 6.22 does the rest! (Note: 8088 and 286 processors do not have the 
capability to take advantage of the MemMaker feature.)

DriveSpace, the integrated disk-compression feature, makes it easy for users to increase their hard-disk 
capacity. And its built-in DoubleGuard technology automatically provides extra protection for your data.

Anti-Virus protects your data by detecting and removing viruses. You can use either version: for 
MS-DOS or for Windows.*

Undelete recovers deleted files and directories. This improved feature, with three levels of delete 
protection, is available in formats for both MS-DOS and Windows.

Backup is the easy way to safeguard your data, and you can use the version that’s easiest for you
—MS-DOS or Windows.*

Highlights

Hard-disk management with data-protection technology

·	DriveSpace can increase the capacity of your hard disk, floppy disks, or removable media. 
	Once installed, DriveSpace is maintenance-free because it’s built into the operating system.
·	More memory—part of DriveSpace loads into high memory to save up to 12K of conventional 
	memory.
·	The DoubleGuard technology in DriveSpace works in the background to automatically provide 
	an extra layer  of protection for your data.
·	Uncompress allows for quick, easy uncompression of compressed drives.
·	AutoMount lets you automatically mount compressed floppy disks and other removable media 
	from either the Windows File Manager or the MS-DOS command line.
·	Defrag and SMARTDrive are optimized to work with DriveSpace to help improve hard-disk 
	performance. For example, SMARTDrive caches compressed data as well as CD-ROM drives.
  
Memory management

·	MemMaker runs in two modes, express and custom, which allows you to customize settings. 
	It optimizes memory to provide maximum memory for MS-DOS–based applications.
·	New technology in EMM386 automatically recovers up to 200K of upper memory.
·	Enhanced mem command gives you details about available upper memory.
  ·	ScanDisk helps protect your data by repairing a variety of data problems on both uncompressed
	and DriveSpace disks. It also finds physical defects and moves data to a safe place on your disk
·	Backup for MS-DOS and Windows can be customized, and you can even view a file’s contents 
	before you  back it up.

Extra data protection

·	Anti-Virus for MS-DOS and Windows detects and eliminates more than 800 computer viruses 
	on network  drives, in memory, and on hard and floppy disks. VSafe, a memory-resident utility, 
	provides continuous virus protection.
·	Undelete for MS-DOS and Windows allows you to recover discarded files, directories, and lost 
	data, even on network drives, using three levels of data security.

Enhanced features

·	Comprehensive online documentation provides full-screen notes for all  MS-DOS 6.22 commands
	 and device drivers plus information about command syntax and switches.
·	Multi-config and Choice help make it easy to configure your PC.
·	Improved Clean Start bypasses your CONFIG.SYS and AUTOEXEC.BAT files to make it easy 
	to start with a  “clean” system when you have configuration problems.
·	Interactive Start lets you step line-by-line through your AUTOEXEC.BAT and CONFIG.SYS files 
	to identify troublesome memory-resident programs and device drivers.
·	The no-swap DISKCOPY command makes floppy-to-floppy copies without laborious multiple 
	swaps.
·	Copy-overwrite protection keeps you from accidentally overwriting a file with the same name.
·	Commas in numbers make numbers easier to read. No more fingerprints on your screen from 
	counting digits!
  
Specifications

System requirements

·	MS-DOS operating system version 2.11 or later, OS/2®, or an operating system compatible 
	with MS-DOS  2.11 or later, including PC-DOS 6.1
·	Personal computer with an 8088 or higher processor
·	512K of memory
·	5.25-inch or 3.5-inch disk drive
·	Optional: Microsoft Mouse or compatible pointing device
  
  
Note   This product is an upgrade and can only be installed on PCs running MS-DOS version 2.11 or 
          later, OS/2, or operating systems compatible with MS-DOS 2.11 or later 
          (including IBM® PC-DOS 6.1).
  
Ordering information 

The Microsoft MS-DOS 6.22 Upgrade, for licensed users of previous versions of MS-DOS, PC-DOS, 
and OS/2, is available through retail distributors. This product is also available in packages of 3 or 20.
  
Note   If you use MS-DOS 6 you can upgrade quickly and easily to MS-DOS 6.22 by obtaining the 
          MS-DOS 6.22 Step-Up package.
  
Available formats

·	5.25-inch high-density (1.2 MB) disks
·	3.5-inch high-density (1.44 MB) disks
·	5.25-inch or 3.5-inch low-density disks available upon request
  
© 1994 Microsoft Corporation. All rights reserved.
This data sheet is for informational purposes only. 

MICROSOFT MAKES NO WARRANTIES,  EXPRESS OR IMPLIED, IN THIS SUMMARY.

Company names and/or data used in screens are fictitious.
Microsoft, DriveSpace, MS-DOS, and Windows are either registered trademarks or trademarks of 
Microsoft Corporation in the United States and/or other countries. IBM and OS/2 are registered 
trademarks of International Business Machines Corporation.
Microsoft Pty., 65 Epping Road, North Ryde, NSW 2113, Australia
Microsoft Canada Inc., 320 Matheson Blvd. West, Mississauga, ON L5R 3R1, Canada
Microsoft Hong Kong Ltd., 11/F., Cityplaza 4, 12 Taikoo Wan Road, Hong Kong
Microsoft New Zealand, 12th Floor, Microsoft House, 67,69 Symonds Street, PO Box 8070 Symonds 
Street, Auckland 1, New Zealand
Microsoft Caribbean, Inc., Metro Office Park, 11 Calle 1, Suite 104, Guaynabo 00968-1726, Puerto Rico
Microsoft Singapore Pte Ltd, 10 Anson Road #21-15, International Plaza, Singapore 0207, Singapore
Microsoft Ltd, Microsoft Place, Winnersh, Wokingham, Berkshire, RG11 5TP, United Kingdom
Microsoft Corporation n One Microsoft Way n Redmond, WA 98052-6399 n USA

0594 Part No. 098-55207 (electronic data sheet)

Part No. 098-55206 (printed data sheet)
 