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How much is 3 megabytes?

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It's about as much as a MP3 Song
(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 3 megabytes (mB) 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 three-fifths as much as The Complete Works of William Shakespeare
In other words, 3 megabytes is 0.57 times the amount of The Complete Works of William Shakespeare, and the amount of The Complete Works of William Shakespeare is 1.8 times that amount.
(ASCII, plain text)
The Complete Works of William Shakespeare would occupy about 5.3 megabytes (mB) 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 two times as much as a Digital Photo
In other words, 3 megabytes is 2 times the amount of a Digital Photo, and the amount of a Digital Photo is 0.5 times that amount.
(5.3 megapixels, JPEG compression, 100% quality, 24 bits/pixel)
A 5.3-megapixel digital camera photo requires about 1.5 megabytes (mB) of storage space. In 2010, it was expected that 90% of all professionally-taken photographs would be digital instead of film.
It's about two times as much as a Floppy Disk (3½-in)
In other words, 3 megabytes is 2.13333 times the amount of a Floppy Disk (3½-in), and the amount of a Floppy Disk (3½-in) is 0.468751 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 1.40625 megabytes (mB). 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 one-two-hundred-fiftieth as much as a Compact Disc
In other words, 3 megabytes is 0.00407 times the amount of a Compact Disc, and the amount of a Compact Disc is 245.8 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 1,500 times as much as a Page of Text
In other words, 3 megabytes is 1,300 times the amount of a Page of Text, and the amount of a Page of Text is 0.0008 times that amount.
(50 lines, 50 characters per line, ASCII encoding)
A 50-character-per-line, 50-line page of Latin alphabet text requires 0.0024 megabytes 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 one-one-thousand-five-hundredth as much as an HDTV Television Show (30 Minutes)
In other words, 3 megabytes is 0.00069 times the amount of an HDTV Television Show (30 Minutes), and the amount of an HDTV Television Show (30 Minutes) is 1,440 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.