As part of the upgrade, the Windows partition will be resized smaller and a new partition will be created (usually 450MB, but might be larger). This can occur even if the new WinRE files would have fit on the existing WinRE partition or the WinRE files exist on the Windows partition. When Windows 10 is upgraded to a new version (1511, 1607, 1703, etc.) it may create a new WinRE partition. The Windows Recovery (WinRE) Partition and Windows Upgrades
Partition 2: Recovery, 450MB - (WinRE, new partition created with upgrade). Partition 1: Windows, 499GB - (booting files, Windows 10). The same system as above after upgrading Windows 10: Partition 1: Windows, 500GB - (booting files, WinRE, Windows 10). The following partitions exist in a normal clean Windows 10 installation to an existing 500GB active primary partition: Partition 2: Windows (size depends on drive). Partition 1: System Reserved, 500MB - (booting files, WinRE). The following partitions exist in a normal clean Windows 10 installation to an empty MBR disk: Standard Windows 10 Partitions for MBR Disks (Legacy booting) Partition 6: Recovery partition, 8GB - (OEM Recovery). Partition 5: Recovery partition, 500MB - (current Windows 10 WinRE). Partition 3: Microsoft reserved partition, 128MB (not visible in Windows Disk Management). 
Partition 1: Recovery partition, 1GB - (original Windows WinRE).The following layout started as an earlier Windows OEM installation and changed into its current configuration as a result of multiple Windows upgrades: Partition 5: RECOVERY, 10GB - (OEM Recovery).
Partition 4: Recovery Partition, 980MB - (WinRE). Partition 3: Windows, 465GB - (Windows 10). Partition 2: Microsoft reserved partition, 16MB (not visible in Windows Disk Management). The following OEM layout has custom sizes for the partitions and includes an additional recovery (OEM, not WinRE) partition: Partition 4: Windows (size depends on drive). Partition 3: Microsoft reserved partition, 16MB (not visible in Windows Disk Management). Partition 1: Recovery partition, 450MB - (WinRE). The following partitions exist in a normal clean Windows 10 installation to a GPT disk: Standard Windows 10 Partitions for GPT Disks (UEFI booting) OEM installations may also have additional OEM tool and/or recovery partitions. Note that there are many possible configurations and they can change depending on a number of factors. The purpose of this article is to help with understanding the standard partitions for Windows 10 installations on both MBR and GPT disks.
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