Microsoft(R) Product Support Services Application Note (Text File)
PD0745: DOUBLESPACE QUESTIONS AND ANSWERS
Revision Date: 5/93
The following information applies to Microsoft MS-DOS , version 6.0
Upgrade Copyright 1993.
| INFORMATION PROVIDED IN THIS DOCUMENT AND ANY SOFTWARE THAT MAY |
| ACCOMPANY THIS DOCUMENT (collectively referred to as an Application |
| Note) IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER |
| EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR |
| PURPOSE. The user assumes the entire risk as to the accuracy and |
| the use of this Application Note. This Application Note may be |
| copied and distributed subject to the following conditions: 1) All |
| text must be copied without modification and all pages must be |
| included; 2) If software is included, all files on the disk(s) |
| must be copied without modification (the MS-DOS utility diskcopy is |
| appropriate for this purpose); 3) All components of this |
| Application Note must be distributed together; and 4) This |
| Application Note may not be distributed for profit. |
| Copyright (C) 1993 Microsoft Corporation. All Rights Reserved. |
| Microsoft and MS-DOS are registered trademarks and Windows is a |
| trademark of Microsoft Corporation. |
| Novell and NetWare are registered trademarks of Novell, Inc. |
| Stacker is a registered trademark of STAC Electronics. |
| This document was created using Microsoft Word for Windows(TM). |
1. Q. How can I receive the Stacker(R) Conversion Disk?
A. You can order the "Conversion Disk for Users of Stacker" by
sending in $10 and the Conversion Disk Offer coupon from your
"Microsoft MS-DOS 6 User's Guide." Unfortunately, we cannot
make this conversion tool available electronically. For more
information on the MS-DOS 6 Stacker Conversion tool, call
Microsoft Sales and Service at (800) 228-7007.
2. Q. Why does DoubleSpace create a drive identified by the letter H
when I have drives A, B, and C only?
A. To avoid conflicts with existing drives, DoubleSpace examines
the existing drive assignments during installation to find the
highest drive letter currently in use. It then skips the next
four letters and assigns the fifth letter to the new
For example, if your computer has two floppy disk drives (A and
B) and a hard disk drive (C), DoubleSpace locates the highest
letter (C); skips drive letters D, E, F, and G; and then
assigns drive letter H for its own use.
For more information, refer to the "Freeing Disk Space" chapter
in the "Microsoft MS-DOS 6 User's Guide."
3. Q. I am currently using a third-party disk-compression software
package and now want to convert to DoubleSpace. How can I do
A. To convert to a DoubleSpace drive, use the following steps:
1. Install the MS-DOS 6 Upgrade if you haven't already done so.
2. Back up your program and data files on all drives using
Microsoft Backup or a third-party utility.
3. Create a bootable MS-DOS floppy disk. To do this, insert the
original MS-DOS 6 Setup Disk 1 in either drive A or drive B,
type the following command, and then press ENTER
where< drive> is the floppy disk drive containing Setup Disk
Important: After you type the above command and Setup
prompts you to insert a disk to create the startup floppy
disk, you MUST create that disk in drive A. Also, be sure
that you choose to install on drive A.
4. Verify that the disk you have just created is bootable by
inserting the disk in drive A and pressing CTRL+ALT+DEL. If
your system starts up, continue with the next step. If it
does not, reboot from your hard disk and repeat step 3 until
you have created a bootable floppy disk.
5. Format the drive with the compressed volume file (CVF). To
do this, type the following command at the A: prompt and
then press ENTER
NOTE: If you are formatting drive C, use the /s switch with
the format command to make the hard disk bootable.
6. If you formatted a drive other than C, skip to step 7. If
you formatted drive C, you must reinstall the MS-DOS 6
Upgrade. To do this, insert Setup Disk 1 in drive A or drive
B, type the following command, and then press ENTER
Follow the steps on the screen to install the MS-DOS 6
NOTE: If you used Microsoft Backup for MS-DOS to back up
your compressed drive, be sure to reinstall Backup for MS-
DOS when Setup prompts you to do so. (You need this program
to restore your backup disks.)
7. Install DoubleSpace. To do this, type DBLSPACE at the MS-DOS
command prompt, press ENTER, and then follow the steps on
NOTE: For more information on DoubleSpace, refer to the
"Freeing Disk Space" chapter in the Microsoft MS-DOS 6
User's Guide or type HELP DBLSPACE at the MS-DOS command
prompt and press ENTER. For more information on Microsoft
Backup, refer to the "Managing Your System" chapter in the
Microsoft MS-DOS 6 User's Guide.
8. Restore the files from your backup disks by using Microsoft
Backup or your third-party backup utility. If you are using
a third-party backup utility, you must install the software
onto the hard disk. Refer to the manufacturer's
documentation for the procedure to do this.
4. Q. I installed DoubleSpace and now each time I enter Microsoft
Windows I receive the error "Corrupt Swapfile Warning." I have
set up my permanent swap file many times, but I continue to
receive this error. How can I correct this problem?
A. In this case, the error "Corrupt Swapfile Warning" probably
means your permanent swap file is being created on a
DoubleSpace compressed volume. Windows cannot create a
permanent swap file on a compressed volume. To correct this
problem, set the permanent swap file to a noncompressed drive.
Windows contains code to detect and avoid compressed volumes
created with third-party software. However, Windows cannot
detect compressed volumes created with DoubleSpace because
Windows' release predates the release of DoubleSpace.
For more information, refer to the "Freeing Disk Space" chapter
in the" Microsoft MS-DOS 6 User's Guide", or type HELP DBLSPACE
at the MS-DOS command prompt and press ENTER.
5. Q. I am trying to run Windows 3.0 in real mode so that I can
change my permanent swap file with SWAPFILE.EXE. Every time I
try, I receive the error message "Unsupported DOS version;
upgrade to DOS version 3.1 or higher." What causes this error?
A. This is an incorrect message. To correct this problem, run the
SPATCH.BAT file, which is located on your original MS-DOS 6
6. Q. I am running the Defragmenter (defrag) to reorganize the files
on my disk drive, but it appears that the program has stopped.
How should I proceed?
A. If you are running the Defragmenter on a DoubleSpace-compressed
drive, the system may appear to stop when the Defragmenter
calls DoubleSpace to defragment the compressed volume file
(CVF). If this occurs, do not turn off your computer or press
the reset button. If you want to quit DEFRAG or DBLSPACE
/DEFRAG, press the ESC key to interrupt the program.
If you think DEFRAG or DBLSPACE /DEFRAG has stopped responding,
press the ESC key. If this does not work, you must restart your
computer. To do so, it is preferable to press the CTRL+ALT+DEL
key combination; however, if that does not work, press the
reset button or turn off your computer.
7. Q. Because DoubleSpace has assigned drive F for its own use, my
Novell(R) NetWare(R) logon scripts no longer work. How can I
correct this problem?
A. After you install Microsoft DoubleSpace, the drive letter F
(which is normally used by Novell NetWare) may be used by
To work around this situation, you can either use a different
drive letter for your login drive or adjust DoubleSpace so that
it uses a different drive letter for its host drive. You can
usually avoid this problem by making sure your NetWare software
is loaded before you run DoubleSpace to compress your drives.
If your usual NetWare drive letter is unavailable, use one of
the following methods to change the DoubleSpace host drive
- If your CONFIG.SYS file has a DEVICEHIGH=C:\DOS\DBLSPACE.SYS
command, make sure it is placed before any RAMDrive
statements. Changing the order of the RAMDrive and
DBLSPACE.SYS lines in the CONFIG.SYS file changes the
LastDrive setting in the DBLSPACE.INI file, freeing up an
additional drive letter.
- Edit the DBLSPACE.INI file and change the host drive letter.
For specific instructions, order the article titled "Novell
Login Drive Not Available After Installing DoubleSpace" from
the Technical Library.