It's about 30,000 times as much as a Magnetic Stripe Card
In other words, the amount of a Magnetic Stripe Card is 0.0000300 times 6,000,000 nibbles.(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 300 nibbles. 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 1,000 times as much as a Page of Text
In other words, 6,000,000 nibbles is 1,200 times the amount of a Page of Text, and the amount of a Page of Text is 0.00083 times that amount.(50 lines, 50 characters per line, ASCII encoding)
A 50-character-per-line, 50-line page of Latin alphabet text requires 5,000 nibbles 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 two times as much as a Floppy Disk (3½-in)
In other words, 6,000,000 nibbles is 2.03451 times the amount of a Floppy Disk (3½-in), and the amount of a Floppy Disk (3½-in) is 0.4915190 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 2,949,120 nibbles. 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-and-nine-tenths times as much as a Digital Photo
In other words, the amount of a Digital Photo is 0.530 times 6,000,000 nibbles.(5.3 megapixels, JPEG compression, 100% quality, 24 bits/pixel)
A 5.3-megapixel digital camera photo requires about 3,100,000 nibbles of storage space. In 2010, it was expected that 90% of all professionally-taken photographs would be digital instead of film.
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 6,000,000 nibbles 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 half as much as The Complete Works of William Shakespeare
In other words, 6,000,000 nibbles is 0.540 times the amount of The Complete Works of William Shakespeare, and the amount of The Complete Works of William Shakespeare is 1.90 times that amount.(ASCII, plain text)
The Complete Works of William Shakespeare would occupy about 11,000,000 nibbles 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 one-two-hundred-fiftieth as much as a Compact Disc
In other words, 6,000,000 nibbles is 0.00388 times the amount of a Compact Disc, and the amount of a Compact Disc is 257.70 times that amount.(80-minute, 360,000 sector disc; "Red Book" specifications)
A typical, 80-minute capacity compact disc, commonly known as a 1,468,000,000 nibbles disc will actually hold 1,546,000,000 nibbles of data. Such disks are 1.2 mm (0.047 in) thick.