
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.
