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Microsoft KB Archive/106126

From BetaArchive Wiki

Article ID: 106126

Article Last Modified on 1/18/2007



APPLIES TO

  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition
  • Microsoft Windows 95
  • Microsoft Plus! 95 Standard Edition



This article was previously published under Q106126

This information applies to both Microsoft DoubleSpace and Microsoft DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands and file names.

SUMMARY

If a DoubleGuard Alarm message appears, DoubleGuard has detected that an application has damaged memory that DoubleSpace was using. DoubleGuard halts your computer to prevent any further damage to your data.

This article contains information about the four possible DoubleGuard Alarm messages.

MORE INFORMATION

The DoubleGuard Alarm message reads as follows

DoubleGuard Alarm #<nn>

A program has corrupted memory belonging to DoubleSpace. Further disk activity could result in the loss of some or all of the data on your drive. Therefore, DoubleGuard has halted your computer. For more information, see the README.TXT file

where <nn> is 13, 14, 15, or 16.

These errors occur when DoubleSpace detects that a software application, device driver, or terminate-and-stay-resident (TSR) program has corrupted memory used by DBLSPACE.BIN.

   DoubleGuard Alarm Number  Area Corrupted
   ----------------------------------------
   13                        BitFAT buffer

   14                        MDFAT buffer

   15                        File Fragment List

   16                        DBLSPACE.BIN Code Block

                

The following programs are known to cause a DoubleGuard Alarm errors:

Program                         More Information
----------------------          ----------------------------------------
Qemm (in Stealth mode)          Contact Quarterdeck Office Systems for
                                an upgrade
Vertisoft SpaceManager 1.53     Causes DoubleGuard error #15 when used
                                on a 286 machine running MS-DOS 6.2

                

Text from the MS-DOS 6.2 README.TXT:

7.19 You receive a DoubleGuard Alarm message

If a DoubleGuard Alarm message appears, DoubleGuard has detected that an application has damaged memory that DoubleSpace was using. DoubleGuard halts your computer to prevent any further damage to your data.

Normally, each program "owns" a separate area of memory, and does not use memory that another program is already using. However, a few programs contain programming errors that cause them to inadvertently use memory belonging to another program. If such a program inadvertently uses memory belonging to DoubleSpace, that program could write its own data over the data DoubleSpace was storing there. Since the data that DoubleSpace stores in memory usually includes files you are currently using, this could cause damage to your data.

DoubleSpace's DoubleGuard safety-checking feature detects when another program has violated DoubleSpace's memory, and immediately shuts down your computer to minimize the chance of data loss. (If further disk activity were to occur instead, you could lose some or all of the data on your drive, since the data DoubleSpace has in memory is probably invalid due to damage by the other program.)

If you receive a DoubleGuard Alarm message, do the following:

  1. Restart your computer by turning the power switch off and then on again.
  2. Type the following at the command prompt:

    SCANDISK /ALL

    NOTE: If you are using Windows 95, restart your computer to a command prompt before typing this line.

    This runs ScanDisk on all your drives to detect and correct any problems that might have been caused by the program that violated DoubleSpace's memory.
  3. Make a note of which program, if any, you were running when the DoubleGuard Alarm occurred. That program is probably (but not necessarily) the program that caused the DoubleGuard Alarm. If you receive additional DoubleGuard Alarms, take notes about what you were doing and see if you can detect a pattern.



Additional query words: tshoot 6.20 dblguard double guard spaceman

Keywords: KB106126