Updated July 21, 2017
Single-Layer Discs
Standard, single-layer DVDs can store approximately 4.7 GB of data. These single-layer discs are the most common blank discs sold. Some DVDs are manufactured as dual-sided, single-layer discs, which means that data can be stored on both sides of the disc. These discs hold 9.4 GB of data. Blank DVDs that can be written on once are identified as “DVDR” or “DVD +R,” while those that can be deleted and rewritten are identified as “DVD +RW.”
Dual-Layer Discs
Dual-layer discs have two layers of readable data on one side and can typically hold up to 8.54 GB of data. When you buy a movie on DVD, it is usually in this format, since this amount of space allows for better picture quality and more special features. Blank, writable discs of this type are usually marked “DVDR DL” or “DVD +R DL.” Although rare, double-sided, dual-layer discs can hold up to 17 GB of data. In June 2014, there were no manufacturers offering blank dual-layer rewritable discs, or “DVD RW DL.”
Other Formats
While standard DVDs are 12 cm in width, you may sometimes find smaller 8 cm DVDs used for software or promotional videos. A single-sided, single-layer 8 cm DVD can hold 1.46 GB, while a single-sided dual-layer 8 cm DVD can hold 2.66 GB. Dual-sided, single-layer versions can store up to 2.92 GB, while a dual-layer, dual-sided 8 cm DVD can hold up to 5.32 GB. Resources Writer Bio
