DVD capacity

Capacity and nomenclature^[10][11]

Designation		Sides	Layers (total)	Diameter	Capacity
				(cm)	(GB)	(GiB)
DVD-1[12]	SS SL	1	1	8	1.46	1.36
DVD-2	SS DL	1	2	8	2.66	2.47
DVD-3	DS SL	2	2	8	2.92	2.72
DVD-4	DS DL	2	4	8	5.32	4.95
DVD-5	SS SL	1	1	12	4.70	4.37
DVD-9	SS DL	1	2	12	8.54	7.95
DVD-10	DS SL	2	2	12	9.40	8.74
DVD-14[13]	DS DL/SL	2	3	12	13.24	12.32
DVD-18	DS DL	2	4	12	17.08	15.90

DVD - Wikipedia, the free encyclopedia

4.7GB = 4.38GB.

Long story short - media companies / salesmen and women claim that 1GB = 1000 MB, 1MB = 1000KB and 1KB = 1000B. Of course we all know that 1GB = 1024 MB, 1MB = 1024KB and 1KB = 1024B.

So, 4.7GB = 4,700,000,000B according to the companies.

But really, 4,700,000,000 / 1024 / 1024 /1024 = 4.377GB

http://www.videohelp.com/forum/archive/can-you-make-a-4-7-gb-dvd-r-actually-fit-4-7-gb-t313580.html