Dynamic Disk -

Creates an exact copy of data on two disks for fault tolerance.

is a disk management feature introduced by Microsoft starting with Windows 2000. Unlike a basic disk that uses traditional partitions (primary, extended, logical drives), a dynamic disk uses logical volumes that can span multiple physical hard drives. dynamic disk

Unless you are maintaining an older server or have a very specific legacy requirement, it is usually better to stick with or utilize Storage Spaces for your advanced storage needs. Creates an exact copy of data on two