Fixing 100% disk usage in Windows 10 with Chrome and Skype running

I have the solution. I tried all the methods mentioned here and other places. None of them worked, or worked for a short period. 

Here is the permanent solution resource: https://www.drivereasy.com/knowledge/windows-10-microsoft-compatibility-telemetry-high-disk-usage-solved/

 I will also paste here just in case:

Method 1 – Group Policy Editor

1. On your keyboard, press the Windows logo key and R at the same time to invoke a Run command.
2. Type gpedit.mscand click OK.

3. Go to Computer Configuration >  Administrative Templates >Windows Components > Data Collection and Preview Builds.

4) Double-click Allow Telemetry.

5. Select Disabled, then click OK.

Method 2 – Registry Editor

1) On your keyboard, press the Windows logo key and R at the same time to invoke a Run command.

2) Type regeditin the box and click OK.

3) Click YESwhen prompted by User Account Control.

4) Go to HKEY_LOCAL_MACHINE >SOFTWARE > Policies > Microsoft > Windows >DataCollection

5) Double-click Allow Telemetry.

**NOTE:**If you can’t find Allow Telemetry, create it: Right-click on DataCollection and choose New > DWORD (32-bit) Value. Then name the new value Allow Telemetry.

6) Set Value date to 0 (zero) and click OK.

This method worked for me after trying all the other methods.

I have spent too many hours trying to Fix Windows 8, and then Windows 8.1. Then I realized that I am not a MS employee and I took the best decision. It is usual to say in Brazil that if advice was good it would be sold and not given but I will give my advice to anyone who is struggling with this damn 100% disk usage. Downgrade to Windows 7. Don't waste your time trying to solve this. You may even think that the problem is solved after doing something that should not be done but the problem will come back very soon. My best advice is: downgrade to Windows 7 and don't waste your time doing MS job. If MS release a fix in the future for this I will upgrade, otherwise I will never consider this option.

I finally did a system restore to a point in time (in my machine it was 09-September-2015) and since then I've had no issues.

While restoring it was confirmed that there was no program or feature installed. Which means that the problem is more likely to do with Windows update. 

The only thing I still haven't done after restoration is sign into one drive yet (still wary of doing so).  Nevertheless, will have to and will post if there are any problems post that. 

I finally signed into one drive after a week of zero issues and immediately faced 100% disk usage issues. Had to restart machine multiple times. Finally un-linked the One Drive account. Since then again no issues. For me the conclusion is that One Drive is at fault (at least valid in my system). Constantly got the high usage message also from "Office Document Cache Sync".

I finally did a system restore to a point in time (in my machine it was 09-September-2015) and since then I've had no issues.

While restoring it was confirmed that there was no program or feature installed. Which means that the problem is more likely to do with Windows update. 

The only thing I still haven't done after restoration is sign into one drive yet (still wary of doing so).  Nevertheless, will have to and will post if there are any problems post that.

Well like everyone else my Disk usage in Windows 10 was 100% all of them time on only one of my Windows 10 computers. This is how I fixed it:

1. Went into "Startup" tab in "Task Manager." There I disabled a few things that don't need to be running automatically when I start the computer up.
2. Went into the "Add-Ons" and "Extensions" of each of my browsers and disabled non-essentials.  I run four different browsers. Firefox, Chrome, IE, and Edge. It seems that after the last mighty Windows update from Microsoft they took the liberty to sort of enable extensions I never heard of and which only bear their name.
3. I went into "Default Apps" and designated only the ones I wanted. Again after the Windows update they seem to have set many of their new or preferred programs/apps as a default app. Like "Groove" for Music so I set it back to Windows Media Player which I am more familiar with and has more control options. You want to set all your defaults here so that you don't have many similar programs or apps fighting each other for dominance. This remedy gave me some reduction of disk usage.

4)  I went to "All Settings", then to "Privacy", then to "Background Apps" which reads "Let Apps run in the background" at the top of the window. There I turned off many apps I never use and never plan on using. Again I already had these turned off after I first downloaded Windows 10, but my last mighty Windows 10 Pro 1511 update on 11-19-15 which they released on 11-18-15 was a really big update. This update caused the 100% disk usage, and was probably also when these Microsoft background apps were automatically promoted to default status again. This remedy here in "Background Apps" is where I got the most reduction of disk usage, and dropped it down to zero or near zero most of the time.

At least they did not activate Cortana behind my back. I can at least thank Microsoft for that.