And if the SRP is full and there is not enough free space (at least 15 MB) to place the Windows bootloader system files, you will get this error. This is because the System Reserved partition is smaller in previous Windows versions than in Windows 10. We couldn't update the system reserved partition.
When upgrading from Windows 7/8.1 to Windows 10 (or when upgrading to new Windows 10 build), you may receive 0xc1900104 or 0x800f0922 errors: Windows 10 couldn't be installed
“Couldn’t Update the System Reserved Partition” on Windows 10
Windows 10 increase system reserved partition how to#
Run diskpart and list the volumes:Ī complete guide on how to rebuild the BCD and MBR configuration is available in this article. On the installation screen, press Shift+F10 to open a command prompt. (In our case, it was the Windows Server 2012 R2 install media). You can make sure that the System Reserved partition is missing by booting from any Windows boot/installation media ( USB flash drive or DVD). These steps will help you fix Windows boot after deleting a System Reserved partition. If other partitions prevent you from shrinking/ extending the Windows volume, you can restore the bootloader configuration and place it on the partition where Windows is installed. Windows Can’t Boot after Accidentally Deleted System Reserved Partition However, in most cases, it is easier to move the bootmgr configuration to the Windows system partition (this is described in the next section of the article). Now you can place the Windows bootloader files on the new partition: