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How much is 727 yottabytes?

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It's about 600,000,000,000,000,000,000 times as much as a Floppy Disk (3½-in)
In other words, 727 yottabytes is 596,035,000,000,000,032,768.00000000000000000000000000 times the amount of a Floppy Disk (3½-in), and the amount of a Floppy Disk (3½-in) is 0.00000000000000000000167775 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 0.000000000000000001219730 yottabytes. 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 7,999,999,999,999,999,865,782,272 times as much as a Magnetic Stripe Card
In other words, 727 yottabytes is 7,999,999,999,999,999,865,782,272.00000000000000000000000000 times the amount of a Magnetic Stripe Card, and the amount of a Magnetic Stripe Card is 0.000000000000000000000000100 times that amount.
(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 0.0000000000000000000001000 yottabytes. 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.