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I want to know what program is responsible for the constant activity of my hard drive. I have Process Explorer, Process Monitor, Filemon, and Regmon running, but I am still not able to detect what is using my hard drive.

Is this even possible to detect? Something tells me not.

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We'll need more details. What operating system? What hardware? When did the problem start? –  goblinbox Mar 15 '11 at 1:50
    
Windows XP SP2, Intel Centrino Duo T2400 1.83Ghz, 1GB Ram, Nvidia Go 7400, problem started like this week i think. Hard drive starts loading every 10 - 15 seconds. Tried DiskMon but all it does is shows activity and not a single clue to what file is being used... What a useless crap. –  Boris_yo Mar 17 '11 at 1:00
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What is wrong with Process Monitor? Leave it running for a while and then look at the file Events columns under Tools/ Process Activity summary. –  sgmoore Nov 26 '11 at 13:17
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3 Answers

In Windows 7, you can use Resource Monitor (type perfmon /res into the Start menu search box). Look at the Disk tab and sort by "Total (B/sec)".

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Instead of perfmon /res, can also just type resmon. –  Indrek Nov 19 '12 at 16:09
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I use Process Explorer from time to time to get more data about the running processes, such as how much I/O each process is performing.

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(I'm not sure if it's available in Windows XP)

Start perfmon.exe and look for anything that has to with I/O or the hard drive. (In Windows 7 you can see data for every single process there)

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