Microsoft KB Archive/165503

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Description of the File System Troubleshooting Options

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Q165503

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The information in this article applies to:


 * Microsoft Windows 95

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SUMMARY
The System tool in Control Panel contains a set of options for changing file system performance settings. You can use these options when you experience hardware or software compatibility problems.

NOTE: Enabling any of the file system troubleshooting options may seriously degrade system performance.

MORE INFORMATION
To display the file system troubleshooting options, follow these steps:


 * 1) In Control Panel, double-click System.
 * 2) Click the Performance tab.
 * 3) Click File System.
 * 4) Click the Troubleshooting tab.

The following table describes the settings on the Troubleshooting tab:

  File system option    Description ---  Disable New File      This option alters the internal rules for file Sharing And          sharing and locking on hard disks, governing Locking Semantics    whether certain processes can have access to                         open files in certain share modes that guarantee a file will not be modified. This option should be checked only in the rare case that an                        MS-DOS-based application has problems sharing under Windows 95. This sets SoftCompatMode=0 in                        the registry.

Disable Long Name    This option turns off the tunneling feature, Preservation For     which preserves long filenames when files are Old Programs         opened and saved by applications that do not recognize long filenames. This option should be                        checked in the rare case that an important legacy application is not compatible with long filenames. This sets PreserveLongNames=0 in the registry.

Disable Protected-   This option prevents Windows 95 from terminating Mode Hard Disk       interrupts from the hard disk controller and Interrupt Handling   bypassing the ROM routine that handles these interrupts. Some hard disk drives might require this option to be checked in order for interrupts to be processed correctly. If this option is                        checked, the ROM routine handles the interrupts, which slows system performance. This sets VirtualHDIRQ=0 in the registry. (This setting is                        off by default for all computers in Windows 95,                         which is the reverse of Windows 3.x.)

Disable All 32-Bit,  This option ensures that no 32-bit disk drivers Protected-Mode       are loaded in the system, except the floppy Disk Drivers         driver. Typically, you would check this option if the computer does not start due to disk peripheral I/O problems. If this option is                        enabled, all I/O will go through real-mode drivers or the BIOS. Notice that in this case, all disk drives that are visible only in                        protected mode will no longer be visible. This sets ForceRMIO=1 in the registry.

Disable Write-       This option ensures that all data is flushed Behind Caching       continually to the hard disk, removing any For All Drives       performance benefits gained from disk caching. This option should be checked only in the rare cases where you are performing risky operations and must ensure prevention of data loss. For example, a software developer who is debugging data at Ring 0 while creating a virtual device driver would check this option. This sets DriveWriteBehind=0 in the registry. Each option sets a value in the following registry key:

  Hkey_Local_Machine\System\CurrentControlSet\Control\FileSystem Keywords : kbenv kbtool diskmem win95

Issue type :

Technology : kbWin95search kbWin95