1024 times as much as a terabyte, a petabyte (PB) can hold 1024^5 (that's 1,125,899,906,842,624) bytes of information!

1 Petabyte: About 3 years of EOS data (2001)
2 Petabytes: All US academic research libraries
20 Petabytes: Production of hard-disk drives in 1995
200 Petabytes: All printed material OR
Production of digital magnetic tape in 1995

A petabyte can hold:

• About 2 millenia of 128k ogg vorbis audio
• 250 years of good-quality DivX video
• Over 200 million 5 megabyte photographs
• About 1 billion copies of Dostoyevsky's
Crime and Punishment, in plaintext
• The answers to about 10 quadrillion yes or no questions, or one per second for the next 285 million years