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Microsoft KB Archive/103949

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Converting from Third-Party Disk Compression to DoubleSpace PSS ID Number: Q103949 Article last modified on 11-01-1993 PSS database name: O_MSDOS

6.00 6.20


The information in this article applies to:
- Microsoft MS-DOS operating system versions 6.0 and 6.20


If you are currently using Stacker, you can convert to DoubleSpace using a utility that converts Stacker drives to DoubleSpace format. For more information, see the coupon in the back of your printed MS-DOS documentation.

NOTE: The Stacker Conversion utility does not convert Stacker 3.1 drives.

If you are currently using a third-party disk-compression program other than Stacker and you want to convert to DoubleSpace, you need to install MS-DOS 6.0 or 6.2, back up your program and data files, compress your drives, and then restore your program and data files.


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 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


    where <drive> is the floppy disk drive containing Setup Disk 1.

    Follow the steps on the screen to install MS-DOS.

    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 MS-DOS 6.0 or 6.2 “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 “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.

Additional reference words: 6.00 6.20

Copyright Microsoft Corporation 1993.