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  Microsoft(R) Product Support Services Application Note (Text File)
                PD0745: DOUBLESPACE QUESTIONS & ANSWERS
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                                                   Revision Date: 4/93
                                                      No Disk Included

The following information applies to Microsoft MS-DOS 6.0 Upgrade.

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|                                                                    |
| Copyright 1993 Microsoft Corporation. All Rights Reserved.         |
| Microsoft and MS-DOS are registered trademarks and Windows         |
| is a trademark of Microsoft Corporation.                           |
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1.  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
       DoubleSpace drive.
    
       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."

2.  Q. I am currently using a third-party disk-compression software
       package and now want to convert to DoubleSpace. How can I do
       this?

    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
             
             drive:setup /f
       
          where "drive" is the floppy disk drive containing Setup Disk
          1.
          
           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
             
             format drive:
       
          where "drive" is the floppy disk drive containing the CVF.
          
           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
       
             drive:setup
       
          where "drive" is the floppy disk drive containing Setup Disk
          1.
          
          Follow the steps on the screen to install the MS-DOS 6
          Upgrade.
       
           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 the screen.

           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" (without the
           quotation marks) 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.
       
3.  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" (without the quotation marks) at the MS-DOS command
       prompt and press ENTER.
    
4.  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
       Upgrade disks.

