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How much is 42 zettabytes?

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It's about 500,000,000,000,000,000,000 times as much as a Magnetic Stripe Card.
In other words, 42 zettabytes is 500,000,000,000,000,000,000.00000000000000000000000 times the amount of a Magnetic Stripe Card, and the amount of a Magnetic Stripe Card is 0.00000000000000000000200 times that amount.
(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 0.0000000000000000001000 zettabytes. According to legend, Forrest Parry, the IBM engineer who developed the first magnetic stripe card in 1960, was able to solve the problem of adhering the strip to the card after his wife suggested using an iron.
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 35,000,000,000,000,000 times as much as a Floppy Disk (3½-in).
In other words, 42 zettabytes is 33,626,900,000,000,000.00000000000000000000000 times the amount of a Floppy Disk (3½-in), and the amount of a Floppy Disk (3½-in) is 0.00000000000000002973810 times that amount.
(high density, IBM PC format)
Despite common reference to them as "1.44" megabyte (mB) disks, the actual capacity of the most common model of a 3&-in (8.9 cm) floppy disk is 0.0000000000000012490 zettabytes. At the height of their use 1996, there were an estimated five billion disks in use — nearly one for each person on Earth at the time.
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.
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 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.