As of May 2019 update, Windows 10 reserves approximately 7GB of storage for your device for updates and optional files. In this way, updates can be easily installed in the future. However, you can restore this space if you want.
What is reserved space?
Upgrading Windows requires a certain amount of free space. Updates can not be installed if there is not enough space on your PC. With the latest update from May 201
If there was not enough free space on your PC before, Windows could not install updates properly. The only workaround is to free up disk space before proceeding.
With "Reserved Storage," Microsoft Windows 10 provides at least 7 gigabytes of space on your hard drive for updates to be downloaded, regardless of how much space you have.
If the reserved memory is not used by update files, it will be used for apps, temporary files, and system caches, which will improve the daily functioning of your PC.
In other words, reserved memory However, this does not mean that Windows needs an additional 7 GB of storage space. There are likely to be some temporary files stored there that are normally stored on your system drive.
RELATED: Windows 10 Will Soon "Reserve" 7GB of your memory for updates.
To check if space is reserved on your PC.
Before proceeding, you should make sure that your system uses reserved memory. If this is not the case, you do not have to continue because Windows does not reserve any additional space on your device. You can use the Settings app to check if and how much additional disk space is being used on the system.
This feature is automatically enabled on new PCs with pre-installed Windows 10 update 1903 (this is the update of May 2019). When you upgrade from an earlier version of Windows 10, the reserved memory is not activated.
To check if Windows is using the reserved memory, go to Settings> System> Memory. (You can quickly open the Settings app by pressing Windows + i on your keyboard.) Under the list of items that use space, click Show more categories.
Click System & Reserved.
When enabled on your PC, the "Reserved Storage" section is displayed with more than 7 GB of space in use. If "Reserved Memory" is not displayed here, the Memory Reservation feature is not enabled for your system.
Should you disable reserved storage?
You can free up a little space by uninstalling optional features (Settings> Apps & Features> Manage Optional Features) and Language Packs (Settings> Time & Language> Language).
However, if you want to release the maximum amount For space reasons, you must completely disable the reserved storage function. Microsoft recommends this with the following explanations:
Our goal is to improve the daily functioning of your PC by ensuring that critical operating system functions always have access to storage space. Without Reserved Storage multiple windows and application scenarios become unreliable when a user is nearly filling his memory. Windows and application scenarios may not work as expected if they require free space. When reserved space is used, updates, apps, temporary files, and caches will take less valuable free space and should continue to run as expected.
If you need the space, you can feel free to continue and disable the reserved memory. After all, this is still disabled on most Windows 10 PCs in reality and works flawlessly.
Disable Reserved Memory
Before you proceed, be aware of the following: Your change will not take effect immediately. We've tested this and the reserved memory will not be deleted from your system until the next time you install a Windows Update. Fortunately, a simple cumulative update – released every month by Microsoft – caused the reserved space to be removed after we made the following change. (This may change in the future.) Obviously, Microsoft does not want this to be removed by people.)
After we've cleared all this out, let's look at how to use the Registry Editor to disable the allocated memory.
Default Warning: The Registry Editor is a powerful tool whose abuse can make your system unstable or even inoperative. This is a pretty easy hack. As long as you follow the instructions, you should not have any problems. If you've never worked with it, first read how to use the Registry Editor before you start. Be sure to back up the registry (and your computer!) Before making any changes.
Open the Registry Editor by clicking Start and typing "
regedit ". Press Enter to open the Registry Editor, and then allow it to make changes to your PC.
In Registry Editor, use the left sidebar to navigate to the following key. You can also copy and paste it into the address bar of Registry Editor.
HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows CurrentVersion ReserveManager
ShippedWithReserves and double-click on it. 
Change the number under Value Data from 0 to 1, and then click OK.
Done. Close the registry editor and restart Windows to apply the changes.
Your change has been made. However, you might have to wait several weeks before Windows installs an update and clears the reserved memory.
RELATED:  All New in Windows 10, May 2019 Update, Now Available
Download our One-Click Registry Hack
 If you do not feel comfortable dipping yourself into Registry Editor, we've created a registry hack that you can use instead. Download and extract the following zip file:
Disable Reserved StorageRegistry Hack
This file contains a REG file for disabling the reserved memory enforced in Windows and a second file for re-enabling. After extracting, double-click the desired file and accept the prompts asking if you really want to make any changes to your registry.
This hack sets the value of
ShippedWithReserves to 0 We talked about it in the previous section. The other hack involved reactivating the reserved memory by resetting the "value data" to 1 and returning it to the previous state. If you enjoy experimenting with the registry, you should take the time to learn how to create your own registration hacks.
RELATED: How To Create Your Own Windows Registry Hacks