SFF stands for the small form factor. The 2.5” storage drives (including IBM 00AD041) pack a relatively compact size of 2.5 inches. To be exact, their dimensions consist of a 2.7 inches width, a 0.37-inch height, and a 3.96 inches length. The small form factor storage drives are commonly used in laptops and game consoles that have a smaller size than computers. But they’re also a fit for desktop computers and servers.