... capacities.New drives featuring AF are optimized for operation with Windows 7, Windows Vista and Mac OS X Tiger, Leopard, Snow Leopard. ... For older operating systems such as Windows XP, users must run the free WD Align software utility ... , fully protected, non-descript, easy-open package.CompatibilityWorks with Windows 7/Vista/XP/2000, Mac and Linux operating systems. You might ...