   
   MS-DOS 6.22 Step-Up

The MS-DOS 6.22 Step-Up improves on the safety and ease-of-use provided by MS-DOS 6.x, and is 
designed for users of Microsoft MS-DOS 6.0, 6.2 or 6.21 only.  

This document explains what functionality changes your system undergoes when you use the MS-DOS 
6.22 Step-Up; these changes depend on your current version of MS-DOS. This file also describes 
features in MS-DOS 6.22 that are new since MS-DOS 6.0. 

If you currently have:

MS-DOS 5.0 or before

If you have MS-DOS 5.0 or earlier, you cannot use the Step-Up to install MS-DOS 6.22. To upgrade 
your version of MS-DOS, obtain the full MS-DOS 6.22 Upgrade instead.

MS-DOS 6.0

You'll gain all of the MS-DOS 6.22 features and functionality,   including Data Protection Technology. 
You can either keep DoubleSpace compression or replace it with DriveSpace compression.

MS-DOS 6.2

You will not gain any incremental functionality other than the opportunity to convert your DoubleSpace 
drives to DriveSpace.

MS-DOS 6.21

You'll gain the DriveSpace compression technology and all of the other features listed in the following 
section. Safety Features and Enhancements

MS-DOS 6.22 includes Scandisk, a utility that detects, diagnoses, and repairs disk errors on 
uncompressed drives as well as both DriveSpace and DoubleSpace compressed drives. ScanDisk can 
repair file system errors (such as crosslinks and lost clusters) and physical disk errors. ScanDisk keeps
a log of its repairs and enables you to undo any of the changes it made. DriveSpace runs ScanDisk to
check the reliability of your disk before it begins compression. You can also run ScanDisk yourself by 
typing SCANDISK at the command prompt. 

DriveSpace includes DoubleGuard safety checking, which protects your data by verifying data integrity 
before writing to the disk. If DoubleGuard detects that the memory DriveSpace is using has been written 
to by another program, it notifies you and recommends you shut down your computer immediately to 
minimize damage to your data.

The MS-DOS extended-memory manager, HIMEM, automatically tests your system's memory when 
you start your computer. This test can identify memory chips that are no longer reliable. (To turn off the 
memory test, add the /TESTMEM:OFF switch to the command that starts HIMEM.)

Setup now configures SMARTDrive as a read-only cache by default. Even if write-caching is enabled, 
MS-DOS does not display the command prompt until SMARTDrive has written its cache to your disk.
	
The MOVE, COPY, and XCOPY commands now ask you for confirmation before copying a file over 
another file that has the same name. (However, to maintain compatibility with existing MS-DOS batch 
files, these  commands do not prompt for confirmation before overwriting a file when issued from a batch 
file.)
  
Ease-of-Use Features and Other Enhancements

·	SMARTDrive now caches CD-ROM drives.
·	DriveSpace automatically mounts compressed floppy disks and other compressed removable 
	media -- even when Windows is running.
·	You can easily uncompress a DriveSpace drive or even completely uninstall DriveSpace from 
	memory.
·	You can easily convert a DoubleSpace drive to DriveSpace format.   
·	Interactive Start (the F8 key) has been enhanced so that you can now bypass or carry out 
	individual commands in your AUTOEXEC.BAT file and other batch programs. (In MS-DOS 6, 
	this capability was limited
            to your CONFIG.SYS file.) This feature makes it easier to troubleshoot your system 
	configuration.
·	The DISKCOPY command now uses your hard disk as an interim storage area, which makes 
	copying from one floppy disk to another faster and easier.
·	Microsoft Defragmenter makes better use of your computer's extended memory, so it can now 
	defragment much larger disks and disks containing many more files and directories.
·	The output of the DIR, MEM, CHKDSK, and FORMAT commands is much easier to read, since 
	it now includes thousands separators when displaying numbers greater than 999. For example, 
	"1000000 bytes free" now reads "1,000,000 bytes free."
  

 