MS-DOS 6.2 Setup May Overwrite Stacker DBLSPACE.BIN File (105829)


The information in this article applies to:

  • Microsoft MS-DOS operating system 6.2
This article was previously published under Q105829

SYMPTOMS

If you have STAC Electronics Stacker version 3.11 or 4.0, and there is enough space on your host drive to install the MS-DOS 6.2 files, MS-DOS 6.2 Upgrade replaces your Stacker version of DBLSPACE.BIN. As a result, you cannot access your Stacker-compressed drives.

NOTE: This information does not apply to MS-DOS 6.2 Step-Up.

CAUSE

At the time MS-DOS 6.2 was released, the current version of Stacker was 3.10. Microsoft ensured that MS-DOS 6.2 Upgrade and MS-DOS 6.2 Step-Up can detect Stacker 3.10 and do not overwrite it. This ensures you can access your Stacker-compressed drives (even though Stacker 3.1 replaces a core component of MS-DOS [DBLSPACE.BIN]).

Since Microsoft cannot guarantee how MS-DOS will interact with future versions of Stacker, MS-DOS 6.2 Setup was designed to detect and avoid Stacker version 3.10 only.

For Stacker version 3.11, the box and disks still indicate version 3.10. You can tell the difference between Stacker 3.10 and 3.11 by the file dates and sizes. The file date for Stacker version 3.11 is 9/08/93 and the files are marked with the time 3:11 A.M.

RESOLUTION

To work around this problem, contact STAC Electronics to obtain the 62STAC.EXE file, or follow the procedure below. You can order the 62STAC.EXE file from STAC Electronics, or you can download it from the STAC Electronics bulletin board service at (619) 431-7405.

If you are going to obtain the 62STAC.EXE file, use your Uninstall disk to uninstall MS-DOS 6.2, run 62STAC.EXE, and then reinstall MS-DOS 6.2. 62STAC.EXE temporarily updates the Stacker driver in memory, not on disk, so you will need to run MS-DOS 6.2 setup immediately after running the patch.

To replace the MS-DOS 6.2 DBLSPACE.BIN file with the Stacker version of DBLSPACE.BIN:

  1. Use the DELTREE command to delete the DBLSPACE.BIN file in the root of your C drive. For example, type deltree c:\dblspace.bin at the MS-DOS command prompt and then press ENTER.
  2. Put your MS-DOS 6.2 Uninstall disk in drive A and copy DBLSPBIN.HST to your C drive (renaming it DBLSPACE.BIN in the process). For example, type copy a:\dblspbin.hst c:\dblspace.bin at the MS-DOS command prompt and then press ENTER.
  3. Insert a blank floppy disk in drive A and use the SYS command to transfer your MS-DOS system files and the Stacker version of DBLSPACE.BIN to the floppy disk. For example, type sys c: a: at the MS-DOS command prompt and then press ENTER.
  4. Leave the floppy disk in drive A and restart your computer.
  5. Delete the copy of COMMAND.COM on the compressed drive using the DELTREE command located on your host drive. For example, if your host drive is H, type h:\dos\deltree c:\command.com at the MS-DOS command prompt and then press ENTER.
  6. Copy COMMAND.COM from your host drive to the root of your compressed drive. For example, type copy h:\command.com c:\at the MS-DOS command prompt and then press ENTER.
  7. Move your MS-DOS 6.2 DOS directory from your host drive to your compressed drive using the MOVE command. For example, if your host drive is H, type move h:\dos\*.* c:\dos at the MS-DOS command prompt and then press ENTER. When you are given the "Overwrite <filename> (Yes/No/All)?" prompt, press A and then press ENTER.
  8. Remove the floppy disk from drive A and restart your computer.
  9. Use DELTREE to delete the MS-DOS 6.0 versions of IO.SYS and MSDOS.SYS. For example, type the following commands at the MS-DOS command prompt, pressing ENTER after each line:

    deltree /y c:\io.sys
    deltree /y c:\msdos.sys

  10. Use the ATTRIB command to clear the IO.SYS and MSDOS.SYS file attributes on the host drive. For example, type the following commands at the MS-DOS command prompt, pressing ENTER after each line:

    attrib -r -s -h h:\io.sys
    attrib -r -s -h h:\msdos.sys

  11. Copy the MS-DOS 6.2 versions of IO.SYS and MSDOS.SYS to drive C. For example, type the following commands at the MS-DOS command prompt, pressing ENTER after each line:

    copy h:\io.sys c:\
    copy h:\msdos.sys c:\

  12. Use the ATTRIB command to reset the IO.SYS and MSDOS.SYS file attributes on both drives. For example, type the following commands at the MS-DOS command prompt, pressing ENTER after each line:

    attrib +r +s +h c:\io.sys
    attrib +r +s +h c:\msdos.sys
    attrib +r +s +h h:\io.sys
    attrib +r +s +h h:\msdos.sys

MORE INFORMATION

Modification Type:MajorLast Reviewed:11/21/1999
Keywords:KB105829
©2002 Microsoft Corporation. All rights reserved.