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[SOLUTION] Windows 7 Disk Defragmenter High CPU Usage?

We just got Windows 7 up and running. We were using Windows XP 32 bit previously, but hit the 4GB limit and had no choice but to upgrade to Windows 7 64 Bit.

First we hit a snag about non availability of Windows 8 retail versions. Luckily, we managed to get a Windows 7 Ultimate at our nearby store who had a last piece handy. That’s another story.

Here’s something odd we discovered about the disk defragmenter.

UPDATE: Solution posted below

Windows 7 Disk Defragmenter

One issue we discovered was that the Disk Defragmenter took up one full usage of our available CPU (25% in our case as it were running a quad core processor) when it ran, causing fans to run at their maximum

During this period, the hard disk activity was very light. It is as if it is defragging the memory instead of the hard disk. On hitting Task manager, one SVCHOST process is taking up 25% CPU. Presumably, it should be the Disk Defragmenter service hiding under SVCHOST.

I don’t understand why a disk defragmentation requires so much CPU that it spins up the CPU fans to the maximum

Anyone knows why?

UPDATE: The solution was something we did to optimize our system. We had disabled the paging file as we had 8GB of memory, more than enough. After enabling it, Windows 7 disk defragmenter worked the way it should – more disk I/O than CPU usage.

UPDATE 2: Spoke too soon. It appears to be the same even after enabling a minimum 16MB of virtual memory with max 500MB. Ah, the days of Windows XP Defrag… If anyone knows the solution, please share!

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