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How much is 51,000 megabytes?

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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 51,000 megabytes 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 nine-tenths as much as Wikipedia
In other words, 51,000 megabytes is 0.94 times the amount of Wikipedia, and the amount of Wikipedia is 1.1 times that amount.
(2009 figures) (all languages)
As of 2009, Wikipedia held 54,000 megabytes 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, 51,000 megabytes is 0.311 times the amount of an iPod, and the amount of an iPod is 3.22 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 164,000 megabytes. 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, 51,000 megabytes is 11 times the amount of a DVD, and the amount of a DVD is 0.09 times that amount.
(a.k.a. digital video disc) (single-side, single-layer; DVD-5 specification)
A typical capacity digital video disc will hold 4,800 megabytes 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, 51,000 megabytes is 11.8 times the amount of an HDTV Television Show (30 Minutes), and the amount of an HDTV Television Show (30 Minutes) is 0.085 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 2.4 megabytes (mB) of data per second, or 4,320 megabytes 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, 51,000 megabytes is 69.17 times the amount of a Compact Disc, and the amount of a Compact Disc is 0.0145 times that amount.
(80-minute, 360,000 sector disc; "Red Book" specifications)
A typical, 80-minute capacity compact disc, commonly known as a 700 megabyte (mB) disc will actually hold 737.3 megabytes (mB) 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, 51,000 megabytes is 0.01 times the amount of Watson, and the amount of Watson is 83 times that amount.
(data store only)
Watson, the IBM supercomputer famous for competing against humans on the televised trivia game show Jeopardy!, utilizes 4,200,000 megabytes of variously-structured data to formulate answers. While "thinking", Watson processes about 510,000 megabytes of data per second.