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How much is 50 gigabytes?

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It's about as much as a Blu-ray Disc.
(a.k.a. BD) (dual-layer; Blu-ray disc)
A typical Blu-ray disc will hold 50 gigabytes (gB) of data. The increase in capacity versus a standard DVD is possible because of the smaller wavelength of blue light — 405 nanometers instead of 650 nanometers for the red laser light used in a DVD.
It's about as much as Wikipedia.
In other words, the amount of Wikipedia is 1.1 times 50 gigabytes.
(2009 figures) (all languages)
As of 2009, Wikipedia held 53 gigabytes (gB) of publicly written and edited encyclopedia articles on 14.5 million subjects as well as associated commentary and discussion. Wikipedia is among the ten most popular websites on the Internet and the only non-profit entity in that group.
It's about three-tenths as much as an iPod.
In other words, 50 gigabytes is 0.312 times the amount of an iPod, and the amount of an iPod is 3.21 times that amount.
(a.k.a. Apple iPod) (2010 figures; for iPod classic, sixth generation)
A sixth-generation, iPod classic MP3 player offers a storage capacity of 160 gigabytes (gB). Data is stored in the unit's hard drive, a 5,400 RPM SATA drive, which measures about 30 sq. cm (5 sq. in)
It's about eleven times as much as a DVD.
In other words, the amount of a DVD is 0.091 times 50 gigabytes.
(a.k.a. digital video disc) (single-side, single-layer; DVD-5 specification)
A typical capacity digital video disc will hold 4.7 gigabytes (gB) of data. Such disks are 1.2 mm (0.047 in) thick.
It's about twelve times as much as an HDTV Television Show (30 Minutes).
In other words, 50 gigabytes is 11.9 times the amount of an HDTV Television Show (30 Minutes), and the amount of an HDTV Television Show (30 Minutes) is 0.084 times that amount.
(a.k.a. High Definition television, a.k.a. HD) (digital signal, QAM-256; 30 minutes)
Broadcast cable HDTV signals contain about 0.00234 gigabytes of data per second, or 4.22 gigabytes (gB) in a thirty-minute television show. The first High Definition television broadcast was news footage from John Glenn's 1998 mission on the space shuttle Discovery.
It's about 70 times as much as a Compact Disc.
In other words, 50 gigabytes is 69.44 times the amount of a Compact Disc, and the amount of a Compact Disc is 0.0144 times that amount.
(80-minute, 360,000 sector disc; "Red Book" specifications)
A typical, 80-minute capacity compact disc, commonly known as a 0.6836 gigabytes disc will actually hold 0.72 gigabytes of data. Such disks are 1.2 mm (0.047 in) thick.
It's about one-eighty-fifth as much as Watson.
In other words, the amount of Watson is 83 times 50 gigabytes.
(data store only)
Watson, the IBM supercomputer famous for competing against humans on the televised trivia game show Jeopardy!, utilizes 4,100 gigabytes of variously-structured data to formulate answers. While "thinking", Watson processes about 500 gigabytes of data per second.