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How much is 42 zettabytes?

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It's about 10,000,000,000,000 times as much as a DVD.
In other words, 42 zettabytes is 9,900,000,000,000 times the amount of a DVD, and the amount of a DVD is 0.0000000000001000 times that amount.
(a.k.a. digital video disc) (single-side, single-layer; DVD-5 specification)
A typical capacity digital video disc will hold 0.00000000000430 zettabytes of data. Such disks are 1.2 mm (0.047 in) thick.
It's about 10,000,000,000,000 times as much as an HDTV Television Show (30 Minutes).
In other words, 42 zettabytes is 10,900,000,000,000 times the amount of an HDTV Television Show (30 Minutes), and the amount of an HDTV Television Show (30 Minutes) is 0.00000000000009170 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 0.000000000000002130 zettabytes of data per second, or 0.000000000003840 zettabytes 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 65,000,000,000,000 times as much as a Compact Disc.
In other words, 42 zettabytes is 64,140,000,000,000 times the amount of a Compact Disc, and the amount of a Compact Disc is 0.000000000000015590 times that amount.
(80-minute, 360,000 sector disc; "Red Book" specifications)
A typical, 80-minute capacity compact disc, commonly known as a 0.00000000000062170 zettabytes disc will actually hold 0.00000000000065490 zettabytes of data. Such disks are 1.2 mm (0.047 in) thick.
It's about 9,000,000,000,000,000 times as much as The Complete Works of William Shakespeare.
In other words, the amount of The Complete Works of William Shakespeare is 0.000000000000000110 times 42 zettabytes.
(ASCII, plain text)
The Complete Works of William Shakespeare would occupy about 0.00000000000000470 zettabytes when written in plain text without formatting. These works include 38 definitively-attributed plays — 11 tragedies, 17 comedies, and 10 tragedies — as well as 154 sonnets and numerous other poems.
It's about 20,000,000,000,000,000,000 times as much as a Page of Text.
In other words, 42 zettabytes is 21,000,000,000,000,000,000.0000000000000000000000 times the amount of a Page of Text, and the amount of a Page of Text is 0.0000000000000000000480 times that amount.
(50 lines, 50 characters per line, ASCII encoding)
A 50-character-per-line, 50-line page of Latin alphabet text requires 0.00000000000000000210 zettabytes when digitally represented. The Google Books project, which has produced hundreds of millions of pages of digital text, used a robotic device to digitize over eight million titles at a rate of about 1,000 pages per second.
It's about 30,000,000,000,000,000 times as much as a Digital Photo.
In other words, 42 zettabytes is 32,000,000,000,000,000.0000000000000000000 times the amount of a Digital Photo, and the amount of a Digital Photo is 0.0000000000000000310 times that amount.
(5.3 megapixels, JPEG compression, 100% quality, 24 bits/pixel)
A 5.3-megapixel digital camera photo requires about 0.00000000000000130 zettabytes of storage space. In 2010, it was expected that 90% of all professionally-taken photographs would be digital instead of film.
It's about 20,000,000,000,000,000 times as much as a MP3 Song.
In other words, 42 zettabytes is 20,000,000,000,000,000.0000000000000000000 times the amount of a MP3 Song, and the amount of a MP3 Song is 0.0000000000000000500 times that amount.
(a.k.a. MPEG-1 Audio Layer 3, a.k.a. MPEG-2 Audio Layer 3) (128 Kbps, "near-CD-quality"; 3 minutes duration; average)
A three-minute song of typical quality will be about 0.00000000000000300 zettabytes when encoded into MP3 format. The song Tom's Diner by Suzanne Vega was used by AT&T-Bell Labs engineer Karlheinz Brandenburg to test the compression process and is considered the first MP3 song.