Here's our Windows NT Tip for.. May 19, 1998
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Checking Disk Performance
The Performance Monitor (\system32\perfmon.exe) won't monitor disk performance unless you turn on the disk counters first. To do this, go to the Command prompt and type diskperf -Y, then press Enter. Now restart the computer.

When Windows NT starts again, you can monitor disk activity with the Performance Monitor.

Since the counters will affect disk performance (very slightly) you should turn them off when you're finished with your testing. To turn off the counters, go to the Command prompt again, and type diskperf -N, press Enter, and then restart the computer.

For more information, type diskperf at the command prompt and press Enter to view Help on how to turn on and turn off diskperf, and how to specify a remote computer.