Partition 1 - 500 MB (EFI System Partition) - UEFI firmware loads files stored on the EFI System Partition to start installed operating systems.
Partition 2 - 40 MB (OEM Partition) – Boot loaders to launch OEM manufacturer-specific recovery tools.
Partition 3 - 128 MB (Microsoft Reserved Partition) - Note: This partition not visible within Disk Management.
Partition 4 - 750 MB (Recovery Partition) –
Windows RE location. This partition contains Windows Recovery Environment tools and utilities, allowing the user to repair problems that affect the system drive.
Partition 5 - 230 GB (Primary Partition)
Partition 6 - 450 MB (Recovery Partition)
X)
Partition 7 - 6654 MB (Recovery Partition) -
Recovery image location. This partition contains the recovery image that would be restored to the system drive if the Refresh or Reset option in Windows 8/8.1 is used.
Since I did a factory recovery from wds 10 upgraded back wds 8.1
X) The 450 MB Recovery partition was added during the update to Windows 10. I recommend that you do not delete this partition.