If you recently installed the operating system, setting the legacy boot option in the BIOS.After upgrading to Windows® 10 from an older operating system (OS) version, such as Windows 7* or Windows 8.1*.You might have the legacy boot option set in the BIOS:
If you are accelerating the system disk (OS Installed) proceed with details below. Right Click on left panel for the Disk being checked (for example Disk 0, Disk 1, etc) > Properties > Volumes. If the drive is a secondary/data drive (no OS installed), you can use third-party applications such as EaseUS* to convert from MBR to GPT. If you have the legacy boot option set in the BIOS (Basic Input/Output System), it's possible the drive partition table is Master Boot Record (MBR). This article describes methods to convert SSDs from MBR (Master Boot Record) to GPT (GUID Partition Table) partition structure. We don't offer support for third-party tools. We don't endorse the content, products, or services offered.
