Logical Disk Counter in Performance Monitor Unexpectedly Returns a Result of Zero (315043)

SYMPTOMS

When you try to use the following function as a logical disk counter in the Performance Monitor utility, the counter may return a result of 0 (zero) each time that the code is run, regardless of the number of logical disks:

while( RegQueryValueEx( HKEY_PERFORMANCE_DATA,236", 
// logical disk
NULL,
NULL,
(LPBYTE) PerfData,
&BufferSize ) == ERROR_MORE_DATA )
{
// Get a buffer that is sufficiently large.
BufferSize += BYTEINCREMENT;
PerfData = (PPERF_DATA_BLOCK) realloc( PerfData, BufferSize );
}

RESOLUTION

Service Pack Information

To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

   Date         Time   Version            Size    File name
   -----------------------------------------------------------
   30-Jan-2002  17:25  5.0.2195.4886      7,728   Diskperf.sys