Windows 7: Disk activity not showing up in Resource Monitor?

I've noticed that Windows Media Player is thrashing my hard drive whenever I play videos, so I tried to investigate with Resource Monitor. The "Processes with Disk Activity" pane shows it reading about 4Mb/s, but there's nothing to show for it in the "Disk Activity" pane.

Any ideas what's up?

Hello gidyn and welcome to Seven Forums.

In Windows Xp and Windows Vista you would have to add additional performance counters to Task Manager to specifically monitor disk activity. The counters are I/O Reads, I/O Writes, I/O Read Bytes, and I/O Write Bytes. I'm on a work computer running XP so I can't verify if this will work on Windows 7 but you might give it a look.

Identify Processes That Cause High Disk Activity

I'm using Resource Monitor, not Task Manager. Please see the screen shot in my original post.

Resource Monitor is a part of Task Manager. See Step 2 under Here's How.

Resource Monitor

What he meant is Resource Monitor uses ETW as the engine. Perfmon exposes ETW in Performance Monitor > Data Collector Sets > System > Event Trace Sessions. look for NtfsLog... it should be started.. as a matter of fact all the sessions should be started.

NtfsLog is running, as are all the others. All other disk activity is monitored - it's just Media Player that somehow doesn't show up.

ok

Clicked Monitor > Stop Monitoring ... wait for a few sec and then select Start Monitoring.. It should probably resolved by now.

Tried it a few times.

ok restart and check again..

Tried it after a few restarts.