Two 3.5-inch MO disks. New and unopened. From the description: These disks are compatible with MS-DOS Ver. 5 and later, Windows 3.1/95/98/NT4.0/2000/XP, so you can use them without formatting. However, when using with MS-DOS Ver. 5 or later, or Windows 3.1, a 640MB compatible device driver is required.