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My Windows 7 x64 hard disk light is continuously flashing. I had a look in the task manager but i cant find any programs which is over using the memory or cpu. I was wondering if there are any good free / open source tools to monitor hard disk activity which can tell me which program is causing the IO.

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Try disabling your CD/DVD drive in Device Manager. – user131192 Apr 30 '12 at 17:56

sysinternals procmon should do the trick - it lets monitors almost everything that a process does - file write, registry, and file operations

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the sysinternals utilities are incredible, kind of surprising the level of access they provide aren't easily accessible in Windows by now. – BloodyIron Apr 30 '12 at 18:23

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