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I've done numerous scans, no malware at all, I've defragmented the drives, disc clean-up, system refresh, factory settings reset, read loads of posts on this, increased/decreased virtual memory, analysed PC and everything seems fine. I just don't know what else to do.

It shows the 100% disc usage on just a small 1 mb/s but sometimes 30 mb/s, the thing causing the most data/s is sometimes "System", but I cant find out what exactly. Disabling firewall and all antivirus programs didn't help.

Matt
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    We need more information. There are dozens of questions like this question and all of them have things you can try. 100% disk usage is a classic sign of bad hardware. – Ramhound Dec 19 '13 at 19:10
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    1) Why would disabling the firewall have any influence? It seems to me like trying to turn off a radio because you can not use the brakes (or similar unrelated stuff). 2) Please read up on [[S.M.A.R.T.](http://en.wikipedia.org/wiki/S.M.A.R.T.) and [hdparm](http://linux.die.net/man/8/hdparm) – Hennes Dec 19 '13 at 19:21
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    "System" problems are usually a driver issue, and/or a hardware issue as @Ramhound suggests (not necessarily the HDD though). Boot in safe mode -- Still act up? You may (also) want to hit the HDD manufacturer's site and get their recommended drive diagnostics to test your drive. – Ƭᴇcʜιᴇ007 Dec 19 '13 at 19:21
  • At the same time, check for the Higher Level Processes. which will help you which program needs high reads on hard disk. – Kirk Dec 19 '13 at 20:27
  • follow my steps here: http://pastebin.com/AyxAVU60 – magicandre1981 Dec 20 '13 at 18:39
  • I would also recommend to boot into another system. Any linux live CD will do. Boot and see if you get the same issue there. This would help to confirm/disprove HW problem. – Art Gertner Oct 14 '14 at 08:13

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Launch Windows' built-in Resource Monitor tool and go to Disk tab. There you'll see a lot of your disk-related activity. You'll be able to see what files are being read/written to, what applications are doing that, which disks are active and a lot of other useful information. It will help you figure what exactly that "System" process is doing.

Mxx
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I had seen this issue when Windows 8 beta was released and again when Windows Blue which is Windows 8.1 which is now available that it had the same disk driver issue. If you install the latest disk driver for your machine by going to the manufacturer's website and downloading and installing one that is compatible with your Windows 8 or 8.1 machine that should solve your 100% disc speed issue. If you look in your task manager you will only see that the system process seems to be causing the majority of the disk activity. This is due to the SATA driver not interpreting your device correctly. It is also likely that not only are you using a SATA device but that the device is a stack of magnetic spinning disks rather than a solid state drive since this issue doesn't occur with solid state drives and only with regular HDDs (Hard Disc Drives).

  • If down voting on a response that answers a question correctly please specify why it is that the response wasn't useful. –  Dec 20 '13 at 07:55
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Please chk this one out from microsoft:

http://answers.microsoft.com/en-us/windows/forum/windows_8-performance/task-manager-shows-high-disk-usage-above-95/9c87226d-822b-4b5f-87e9-560094a76d9e

user379397
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    Please quote the essential parts of the answer from the reference link, as the answer can become invalid if the linked page changes or the target site is unreachable/permanently offline. – DavidPostill Oct 14 '14 at 08:11