How To: Detect what process is thrashing your hard drive

Published in multiple categories by Steve Sinchak with 134,019 views

Every once in a while you notice that your hard drive is working extra hard for what seems like no reason.  A background process has taken your hard drive hostage, forcing it to thrash loudly as it struggles to keep up with the high rate of reads and writes.  Your computer responds slowly as the process overloads the physical limitations of your drive. What are you to do?

The solution is simple, although a little tricky at times: identify and stop the process that is killing your drive.  There are two methods and tools that you can use to identify the process.

Method 1

  1. Click on the Start Button and key in perfmon.exe /res and hit Enter. This should launch the Resource Monitor on Windows 7 and Windows Vista.
  2. On the overview screen click on the Disk section down arrow to see a list of all processes and the files they are writing or reading from your drives.
  3. Click on the Read, Write or Total headings to sort all disk operations to identify which process and file is currently using the disk the most.

Method 2

  1. Visit Microsoft’s Sysinternals web site and download Process Explorer.
  2. After you have started Process Explorer, click on the View menubar item and then Select Columns.
  3. Click on the Process I/O tab and check:
    • Reads
    • Read Bytes
    • Writes
    • Write Bytes
  4. Hit OK.
  5. You will now see the new columns listed for each process. To identify what process is killing your hard drive, just look for the process with the highest number of Reads or Bytes.

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This is exactly what I was looking for. It's too bad that Windows 7 does not have a 'Reliability and Performance Monitor' and that 'Process Explorer' no longer has I/O Reads, I/O Read Bytes, or I/O Writes check boxes in the "View - Columns - Process Performance tab.

It's time to remove this page as it is no longer accurate (or update it).
Posted by Lance Jones on 3 years ago

The article was originally written for Windows Vista but I just updated it for Windows 7. All of the functionality is still there, just in slightly different places. Also Microsoft moved the I/O settings to a new tab in process explorer.
Posted by Steve Sinchak on 3 years ago

I found it but what do I do with it? I am not sure what I need and what I don't need to keep running.
Posted by kadacozarh on 2 years ago

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