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My new laptop is two months old, the first day I got this laptop I noticed this but I assumed it was a bug in Windows 8. However I still have this issue today after reformatting and installing all updates.

The problem is that the disk shows 99% usage from an application...

In this case Dropbox, but the usage is never over 2 MB/s; in this case it is 0.8 MB/s.

What can I do about this?

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How big is the disk and how much free space do you have on it? Are you having actual performance problems or is the issue merely cosmetic? –  David Schwartz Feb 6 '13 at 0:42
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You're just under the users tab which shows the applications that you have running. What about the system? You may have indexing enabled which is causing the initial large amounts of disk reads/writes. –  kobaltz Feb 6 '13 at 0:46
    
1TB and I am using under 100GB. The PC does feel slower than my old one... and yet the specs are much better. –  Ryuk Feb 6 '13 at 0:47
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The combination of very high disk % usage and low speeds is usually quite rare, except when you are doing a lot of random IO (and download email really is not that kind of IO, no idea about dropbox though) or if there are lots of retrys/errors. If those are occuring then you should be able to see them, either in the event log or in increasing S.M.A.R.T values on the drive. –  Hennes Feb 6 '13 at 0:52
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I was told that the percentage you see under "Disk" is the percentage of time the disk I/O queue is not empty. –  David Schwartz Feb 6 '13 at 6:40

2 Answers 2

I had the same issue. It got resolved after updating Intel® Chipset Device Software. Download this from Intel website for your chipset and install to see if it resolves the issue.

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I've seen a similar behavior on some computers at work. You have a pretty good chance to be infected with a trojan malware. I'll suggest to run malware and virus scans on your PC.

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