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Is there a utility for Windows that operates similarly to iotop for Linux? I'm looking for simple tool that can tell me what applications are writing to disk and how much they're actually writing.

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Which version of Windows are you using? – Sim Dec 1 '09 at 13:45
It's an older laptop that runs XP. – Pridkett Dec 1 '09 at 14:02
up vote 26 down vote accepted

The Disk tab of Resource Monitor in Windows 7/Vista is perfect for this. However if you aren't running Windows 7 then have a look at Process Explorer and add the relevant I/O column counters.

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Exactly what I was looking for. Thanks! – Pridkett Dec 1 '09 at 16:31
The problem with this solution is that if one or more services are eating up diks io time, you won't be able to narrow down since in the task manager all service processes showing up as svchost. – Sandor Feb 15 '15 at 10:59
This isn't really helpful because it just says that "System" or "svchost" are hogging the disk – endolith Nov 6 '15 at 14:47

Windows Sysinternals package incude Process Monitor which monitor every proccess I/O activitys to the File system, Registry or Network. and there is Disk Monitor in addition whith only monitor Disk I/O by request type / sectors / Duration etc ...

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