Earlier this week, Microsoft started rolling out its latest major Windows 10 update, the Fall Creators Update, to millions of PCs around the world.
There are numerous new feature tweaks being introduced with this new update including a new look called the Fluent Design system, a big push toward 3-D modeling and Mixed Reality modes, new login options, Eye Control, and under-the-hood improvements like OneDrive Files-on-Demand, better update control, faster boot times, power throttling, Storage Sense optimizations and more.
If you're looking to get the update as soon as you can, keep in mind that it's a rather large download. According to initial recommendations, you should clear out at least 16GB of free space for the 32-bit version and 20GB for the 64-bit version. Unfortunately, it looks like you'll need more than that.
According to early reports, the Fall Creators Update leaves behind up to 30GB of data on your system when it's done installing. As usual, Windows 10 will keep these files just in case you want to rollback the update. However, this data will be deleted automatically in 10 days.
Why would you want to rollback the update? It depends, but if you encounter any system glitches, driver issues and bugs with the initial build of the Fall Creators Update, rolling back to your old Windows version while waiting for a more stable build is a good option to have.
On the flip side, since the Windows 10 Fall Creators Update is mandatory, sooner or later, you will have to install it anyway. If you are happy with the Fall Creators Update and you have decided to move forward with it, you can always delete the massive 30GB rollback data and reclaim that hard disk space immediately.
Here's one way to clear out the files left behind by the Fall Creators Update. On the Windows Search Bar, type "Disk Cleanup." Right-click on the best match then select "Run as administrator."
The tool will then calculate how much space you will be able to free up on your drives, in this case, we want to check the system drive C. Next, click on the "Clean up system files" button to have the tool rescan your system and see the "Previous Windows Installation(s)" option. Make sure that box is checked, along with the "Temporary Windows installation files" box then click OK to regain the hard drive space.
Another path to this in the Fall Creators Update is Settings >> System, then under "Storage Sense" click on "Change how we free up space." On the next page, check "Delete previous versions of Windows" then click "Clean now" to regain the space.
Warning: Like I mentioned earlier, deleting the previous version will permanently disable any rollback options so proceed with caution. Also, if you haven't rolled back and your 10-day window is up, Windows 10 will automatically delete your previous version files, clearing out space.
It's important that you have a backup of your files too before you proceed with the update, just in case something goes wrong during the upgrade process.
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