MS-DOS 6.2, What's New
What's New in MS-DOS 6.2?
Welcome to Microsoft MS-DOS, the most widely used operating
system for personal computers. MS-DOS 6.2 improves on the safety
and ease of use provided by MS-DOS 6. The rest of this topic
describes features new to MS-DOS 6.2. For information about
features included in both MS-DOS 6 and MS-DOS 6.2, see the Welcome
chapter of the MS-DOS 6 User's Guide.
moved to supplemental disk.
Safety Features and Enhancements
- MS-DOS 6.2 includes
a new utility that detects, diagnoses, and repairs disk errors
on uncompressed drives and DoubleSpace compressed drives.
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. DoubleSpace runs
SCANDISK to check
the reliability of your disk before it begins compression.
You can also run
by typing SCANDISK
at the command prompt. For more information, see
An Introduction to ScanDisk.
- DoubleSpace includes DoubleGuard safety checking, which
protects against data corruption by verifying data integrity
before writing data to your disk. If DoubleGuard detects that the
memory DoubleSpace is using has been corrupted by another
program, it shuts down your computer immediately to minimize
damage to your data.
Although DoubleGuard is on by default, you can turn it
off to save memory. To do this, use the DBLSPACE /DOUBLEGUARD
command, or turn off the DoubleGuard option in the Options dialog
(start DoubleSpace, and then choose Options from the Tools
- The MS-DOS extended-memory manager, HIMEM.SYS, automatically
tests your system's memory when you start your computer. This
test can identify memory chips that are no longer reliable.
(Unreliable memory can result in system instability or loss of
data.) To turn off the memory test, add the
to the command that starts HIMEM.SYS. For more information, see
- 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. This prevents you from turning off your computer
before the data in memory is saved.
- The MOVE,
now ask you for confirmation before copying a file over another
file that has the same name. (However, when issued from a batch
file, these commands do not prompt for confirmation before
overwriting a file.)
Ease-of-Use Features and Other Enhancements
- With MS-DOS 6.2, you can easily uncompress a DoubleSpace
drive or even completely uninstall DoubleSpace from memory. For
more information, see DBLSPACE /UNCOMPRESS.
- SMARTDrive now caches CD-ROM drives. (For this support to be
MSCDEX program must be
loaded before SMARTDrive. To find out if SMARTDrive is caching
your CD-ROM drive, type
at the command prompt. If
lists the drive letter for your CD-ROM drive, the drive is
being cached. For more information, see
- DoubleSpace automatically mounts compressed floppy disks and
other compressed removable media - even when Windows
is running. Although automounting is enabled by default, you can
turn it off to save memory. To do this, use the DBLSPACE
/AUTOMOUNT command, or turn off the Automount option in the
Options dialog (start DoubleSpace, and then choose Options from
the Tools menu).
- You can now bypass or carry out individual commands in your
AUTOEXEC.BAT and other batch programs. (In MS-DOS 6, this
capability was limited to your CONFIG.SYS file.) This feature
makes it easier to isolate problems when you are troubleshooting
problems in your system configuration or in batch programs.
- To step through the commands in your AUTOEXEC.BAT file, press
F8 when your computer starts. For more information, see
"Bypassing CONFIG.SYS and AUTOEXEC.BAT Commands" in the
CONFIG.SYS Commands topic. To step through other batch
files, use the
- If you need to, you can bypass DoubleSpace when you start
your computer. This makes troubleshooting easier and also
temporarily frees memory for use by other applications. For more
information, see "Bypassing DoubleSpace" in the CONFIG.SYS
command now uses your hard disk as an
interim storage area, which makes copying from one floppy disk to
another faster and easier (makes floppy in a single pass) and
can make multiple copies of the same original.
- 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. For more
information on running Defragmenter, see the
- The output of the
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."