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DOUBLESPACE
DOS 6 comes with a data compression program called
DoubleSpace. It may almost double the size of your hard drive by
compressing files. Compression programs use a kind of shorthand
so that repeated data is stored in less space. Actually, a
DoubleSpaced compressed drive is a single file on an
uncompressed drive. Such files are called Compressed Volume
Files (CVF). DoubleSpace is invisible to your programs. You
can use DoubleSpace on both hard disks and floppy disks.
HOWEVER, DON'T USE IT WITHOUT READING THE CAUTIONS BELOW.
DOUBLESPACE CAUTIONS:
1. A DoubleSpaced hard drive is more likely to give trouble
than an uncompressed drive. If you have plenty of room on
your hard drive, don't install DoubleSpace. You will be
much better served with a large hard drive that is not
compressed. To date, there have been many reports of
problems with DoubleSpace. If you need more room, my
advice is to buy another or a larger hard drive.
2. If you plan to use DoubleSpace, you should read the
README.TXT file in the C:\DOS directory.
3. You should not use DoubleSpace if your drive is already
compressed with another compression program. You could
lose all your files!
4. If you run DoubleSpace, you will not be able to uninstall
DOS.
5. You cannot uncompress a drive that has been DoubleSpaced.
Microsoft did not provide an uncompress command.
6. DoubleSpace can compress a drive to a maximum of 512
megabytes.
7. When you run DoubleSpace, DOS creates an extra drive.
If you compressed drive C, you would then have a small
uncompressed drive (perhaps drive H, it depends on your
hardware). Be careful not to move or delete any of the
files in this new uncompressed drive, or it could result in
the data loss of your entire C drive. The files on this
uncompressed drive are: IO.SYS, MSDOS.SYS,
DBLSPACE.BIN, DBLSPACE.INI, and DBLSPACE.000. These
files are Hidden and have a Read-Only attribute. To
determine where DOS placed this uncompressed drive,
type DBLSPACE/INFO <ENTER> after you install DoubleSpace.
If you want to see these hidden files, you can use the
DIR/A command. Remember, don't fool with these files!
8. Before you use DoubleSpace to compress a drive, it is a
good idea to back up your drive. NOT DOING SO COULD
RESULT IN A PERMANENT LOSS OF ALL YOUR DATA.
9. If you plan to install Windows, you should do it before you
run DoubleSpace. Windows has a swap file that should be
stored on an uncompressed drive. If you install Windows
first, DOS will automatically take care of this for you.
10. Disable any screen blankers before you run DoubleSpace.
11. DoubleSpace cannot be run from Windows. DoubleSpace
should be run only at the DOS prompt.
12. Use the CHKDSK command to keep an eye on any DoubleSpaced
drive. This command will often inform you when (or if)
there is trouble.
This section is finished. It is an excerpt from LEARNING DOS FOR
THE COMPLETE NOVICE, by Steven Woas, copyright 1993. When you register
this program, you will receive the 336 page book, LEARNING DOS FOR THE
COMPLETE NOVICE which covers DOS 3.2 through DOS 6. To register send
$15.95 plus $2.00 for shipping to:
Celestial Press
4424 Dohrcrest Dr.
Suite C
New Port Richey, FL 34652
Phone (813) 845-8522
US customers can order toll-free 1-800-330-3311
Fax (813) 845-8522
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