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The Physical Disk Is Displayed with the Drive Letter Enumerated in System Monitor

Article ID: 267842 - View products that this article applies to.

This article was previously published under Q267842

SUMMARY

In Microsoft Windows NT 4.0 and earlier, logical disk and physical disk counters are displayed as separate items in Performance Monitor whereas in Windows 2000, these objects are displayed as merged objects in System Monitor.

MORE INFORMATION

The operating system does not add a new counter section, but in Windows 2000, the logical information is displayed with the physical disk counters. If you are interested in correlating the logical disk information to the physical disks, you can configure the operating system to include driver letters in addition to the disk number as part of the counter names. For example, for this type of naming scheme, counters appear as displayed in the following sample:

Drive 0 C: D: (where the disk 0 is partitioned in two logical drivers
Drive 1 E:
Drive 2 E:
Drive 3 E: (where the logical drive E uses three physical disks)

Define a new REG_DWORD value under the following key, and type the name NT4 Instance Names:

HKLM\System\CurrentControlSet\Services\Perfdisk\performance

Value = 1: Restores the previous format.
Value = 0: Implements the new format (equal to no value).

Note: This may cause some third-party parsing routines to stop functioning. Please check with your vendor to to see if their performance parsing routines can handle the registry change, and then test it before you implement the changes.