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.