PD0836: MS-DOS DoubleSpace Compressed Volume File Format
PSS ID Number: Q107563
Article last modified on 11-24-1993
PSS database name: O_MSDOS

6.00 6.20

MS-DOS


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The information in this article applies to:

 - Microsoft MS-DOS operating system versions 6.0 and 6.2
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SUMMARY
=======

Microsoft has an Application Note that contains document and source code
files that describe the format of the DoubleSpace compressed volume file
(CVF) and the use of the DoubleSpace System application programming
interfaces (APIs).

"MS-DOS DoubleSpace Compressed Volume File (CVF) Format," PD0836, can be
found in the Software/Data Library by searching on the word PD0836, the Q
number of this article, or S14398. PD0836 was archived using the PKware
file-compression utility.

You can also obtain this Application Note by calling Microsoft Product
Support Services at (206) 454-2030.

MORE INFORMATION
================

The following is the text of the Application Note:

======================================================================
  Microsoft® Product Support Services Application Note (Text File)
    PD0836: MS-DOS DOUBLESPACE COMPRESSED VOLUME FILE (CVF) FORMAT
======================================================================
                                                  Revision Date: 11/93
                                                       1 Disk Included

The following information applies to Microsoft MS-DOS versions 6.0
and 6.2.

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| 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.                                |
|--------------------------------------------------------------------|

DOUBLESPACE System Application Programming
------------------------------------------
Interfaces (API) and CVF Format
-------------------------------

MS-DOS DoubleSpace integrated disk compression includes the DoubleSpace
System Application Programming Interfaces (API), which are supported by
DBLSPACE.BIN. The enclosed PD0836 disk contains the following document and
source code files, which describe the format of the DoubleSpace compressed
volume file (CVF) and the use of the DoubleSpace System API:

   Filename       Contents
   ---------------------------------------------------------------

   CVF.DOC        Overview of DoubleSpace CVF format (a Word for
                  Windows document)

   CVF.H          Definitions for the DoubleSpace CVF

   CVF.PS         PostScript file that can be sent to a
                  PostScript printer

   DRVINFO.C      Functions to identify and flush DoubleSpace
                  drives

   DRVINFO.H      Definitions for IsDoubleSpaceDrive() function

   DSAPI.DOC      DoubleSpace System API specification (a Word
                  for Windows document)

   DSDUMP.EXE     DoubleSpace File Dumper version 0.58

   IOCTL.ASM      Functions to flush and flush and invalidate
                  DoubleSpace cache

   MAIN.C         DSDUMP.EXE source code (shows details of CVF
                  format)

   MAKEFILE       Makefile for DSDUMP.EXE

   README.TXT     Contains this table

   TEST.C         Test IsDoubleSpaceDrive() function in DRVINFO.C
                  and DRVINFO.H

NOTE: These source code files were built with Microsoft C Compiler
version 6.0a and Microsoft Macro Assembler (MASM) version 5.1a.

Additional reference words: 6.00 6.20 appnote application note dos

Copyright Microsoft Corporation 1993.