DOCUMENT:Q82709 03-OCT-1999 [win95x] TITLE :SMARTDRV Cache Status -- What Does the Buffering Value Mean? PRODUCT :Microsoft Windows 95.x Retail Product PROD/VER:MS-DOS:6.0,6.2,6.21; WINDOWS:3.0,3.0a,3.1,3.11 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows versions 3.0, 3.0a, 3.1, 3.11 - Microsoft Windows for Workgroups versions 3.1, 3.11 - Microsoft MS-DOS operating system versions 6.0, 6.2, 6.21 ------------------------------------------------------------------------------- SUMMARY ======= In MS-DOS, Windows, and Windows for Workgroups, the character-mode display of the status of SMARTDrive has a column for buffering status. The entry in this column can be "yes," "no," or "-" (MINUS SIGN). This article describes the meaning of these entries. MORE INFORMATION ================ The following is an example of the printout you receive if you access SMARTDrive from the command prompt by typing smartdrv and pressing the ENTER key: Microsoft SMARTDrive Disk Cache version 4.0 Copyright 1991,1992 Microsoft Corp. Cache size: 1,048,576 bytes Cache size while running Windows: 1,048,576 bytes Disk Caching Status drive read cache write cache buffering -------------------------------------------- A: yes no no B: yes no no C: yes yes yes F: yes yes - G: yes no no For help, type "Smartdrv /?" The column labeled "buffering" describes the state of double buffering. "Yes" in this column means that double buffering is being performed on the corresponding drive. "No" means that buffering is not being performed on the corresponding drive. The state indicated by a MINUS SIGN means that SMARTDRV.EXE cannot determine if buffering is needed. SMARTDRV.EXE watches each data transfer to determine the need for buffering. If it sees a transfer to an upper memory block (UMB), it may be unable to determine if there is a need for double buffering. NOTE: The double buffer driver must be loaded for SMARTDRV.EXE to determine if there is a need for buffering. If the double buffer driver is not loaded, all entries in the buffering column read "no." The double buffer driver is loaded from the CONFIG.SYS file. The following is a sample line to install the double buffer driver: DEVICE=C:\WINDOWS\SMARTDRV.EXE /DOUBLE_BUFFER Even if you install the double buffer driver, SMARTDRV.EXE may decide that it is not needed. In this case, the double buffer driver is not loaded and does not take up any memory. You can force the double buffer driver to load even if SMARTDRV.EXE decides that it is unnecessary. Adding a PLUS SIGN (+), as in the following example, forces the double buffer to load: DEVICE=C:\WINDOWS\SMARTDRV.EXE /DOUBLE_BUFFER+ Additional query words: 3.00 3.10 3.11 6.00 6.20 winfest 3.0a ====================================================================== Keywords : Technology : kbAudDeveloper kbWin3xSearch kbWFWSearch kbZNotKeyword3 kbWin300 kbWin300a kbWin310 kbWin311 kbWFW310 kbWFW311 kbMSDOSSearch kbMSDOS621 kbMSDOS620 kbMSDOS600 Version : MS-DOS:6.0,6.2,6.21; WINDOWS:3.0,3.0a,3.1,3.11 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.