A unit of computer memory or data storage capacity equal to 1,024 terabytes (250 bytes). (noun)
One quadrillion bytes. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "petabyte" in a sentence
"The Internet Archive has just installed its first Petabox, "a machine designed to safely store and process one petabyte of information (a petabyte is a million gigabytes).""
"Do the math and you will see (a petabyte is 1024 terabytes a terabyte is 1020 gigabytes and so on) in order to just get 1 petabyte the hub would need 1024 users sharing a terabyte) I think anyone familiar with shares knows how unlikely this scenario is."
"(A petabyte is the equivalent of a stack of DVDs stretching from here to the moon.)"