MiniDVD (Mini DVD or miniDVD) is a DVD disc which is 8 cm in diameter. Most MiniDVDs hold 1.4 GB of data, but there are variants that hold up to 5.2 GB.
The 8 cm optical disc format was originally used for music CD singles, hence the commonly used names CD single and miniCD. Similarly, the manufactured 8 cm DVDs were originally used for music videos and as such became known as DVD single.
MiniDVD is known also as "3 inch DVD", referring to its approximate diameter in inches.
A MiniDVD can be played back in most Blu-ray and DVD players that are tray loaded. The trays on players and DVD drives have an inner ring where the 8 cm disc is centered for loading in the player. Most slot loading players cannot use this format; there are exceptions, however, such as the PlayStation 3 and the Wii, but not the Wii U. Both officially support 8 cm discs.