A:Answer Hi JSC9, HDD or Hard Disk Drive is a data storage device that consists of mechanical parts inside. HDD rely on spinning disk, or metal platter with a magnetic coating, to read and write data. Solid-state drives or SSDs, which means there are no moving parts in the drive. Without the spinning disk, head, and arm, SSDs can go down to the shape and size, making them more flexible for smaller devices. -Need Help? Please see our "'Contact Us" page for information