
Because when extending a partition using Disk Management, there must be contiguous Unallocated space on the right. Can't extend system reserved partition with diskpart or Disk ManagementĪlthough there's Extend Volume in Windows 10/8/7 Disk Management tool, you cannot extend System Reserved partition by shrinking C or other volume. You can solve this problem by extending System Reserved partition in Windows 10/8/7. When you upgrade Windows 7/8 to Windows 10, original System Reserved partition is too small.
The System Reserved partition consumes 100 MB of space on Windows 7, 350 MB of space on Windows 8, and 500 MB of space on Windows 10. The System Reserve Partition (SRP) is a small partition on your hard drive, some third-party anti-virus and security apps write to the SRP, and can fill it up. When upgrading from Windows 7/8 to Windows 10, or updating Windows 10/8/7, you might encounter the error " We couldn't update system reserved partition", error code 0xc1900104, or error code 0x800f0922. This is because: In general, you don't need to care about the System Reserved partition.