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Is there a program that allows me to identify which process is using my hard disk the most? And kill it?

It's just that, sometimes, out of nowhere my hard disk starts to being busy with something, like it's defragmenting, and this slows down my programs to a crawl, and I'd like to avoid this, or at least, understand what's happening.

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use your task manager to see whats running. Anything that would cause this would be a process. – Ramhound Dec 20 '11 at 19:38
Try typing perfmon.exe into the run dialog you get your drive performance. @NomenNescio – Davidenko Jan 8 '15 at 20:04

Diskmon from sysinternals can help you with this.

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