How to Extend a System Reserved Partition on Windows 7/8/10

A System Reserved partition is a Windows partition that is created when you clean install Windows 7/8/10. This partition contains necessary files to start your computer. It stores the boot configuration and boot manager data. Whenever you start your computer the boot manager gets started and reads the boot data from this partition. The bootloader is booted which starts the Windows OS from the main system drive. Another use of System Reserved partition is with BitLocker drive encryption. If you want to use the BitLocker drive encryption then it can only be done with a System Reserved partition as it will contain necessary files to load the encrypted system drive.

The System Reserved partition acquires 100 MB space on Windows 7, 350 MB on Windows 8, and 500 MB on Windows 10. The main problem with this partition is that it can't be extended easily. Whenever you try to extend it in the disk management console then you will find that the 'Extend' option is greyed out. So why there is a need to extend the System Reserved partition. Yes, there is a need to do this if you are upgrading your PC/laptop from Windows 7/8 to Windows 10. Since these former versions of Windows require 100 MB and 350 MB space as reserved then Windows 10 installation may fail because of low reserved space because it requires at least 500 MB. A common error can be seen while upgrading to Windows 10 as "We couldn’t update the system reserved partition." This happens due to low space in the System Reserved partition.

So if you are upgrading from Windows 7/8 to Windows 10 then before upgrading extend your PCs System Reserved partition to at least 500 MB. In this tutorial we will teach you how you can do this safely without any error or data loss. You can also read, upgrade to Windows 10 for free in 2017.


  • To be on a safe side first of all backup your data on an external drive.
  • You can also create an image of C:\ drive using the EaseUS Todo backup software. If anything goes wrong then you can restore your PC back to its normal state.
We are sure that this tutorial that we are going to tell you won't result in any error or data loss. But still it is a good idea to have backup of your precious data on an external drive.

How to Extend a System Reserved Partition on Windows 7/8/10

  • Download and install MiniTool partition wizard from this link - download
  • Open it and click 'MiniTool Partition Wizard Free' on the welcome screen.

  • Here find the 'System Reserved' partiton. Right click on it to select 'Extend' or first select it then click 'Extend Partition' in the left option's pane.

extend system reserved partition windows 7
  • Now a popup will open asking you to select the required space for the System Reserved partition. Make sure to drag the slider towards left so that the total space gets only 500 MB. Don't make the partition bigger than 700 MB as there is no use of making this partition spacious beyond the accepted limit.
  • Now select the Drive from which you want to take space to allocate to the System Reserved partition. You can select C:\, D:\, or E:\ or whatever partition you have. Make sure you have backup of this donor partition.
  • Now after selecting the space and the donor drive click 'OK'.
  • Now click the 'Apply' button on the top left corner to start the extend partition operation.
  • Wait for few minutes and do not cancel the process at any cost.
  • You will be notified when the operation gets finished.
  • Now open disk management console and check the space of the System Reserved partition. It will be greater than 500 MB. To open disk management console, open command prompt and type 'diskmgmt' without single quotes.

So you have successfully extended a System Reserved partition. Now you can safely upgrade a Windows 7/8 computer to Windows 10 without getting any partition updating error.

If you have any questions then ask via comments and if you liked this article then do take two minutes to share it.

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