When measuring bytes, it is not dishonourable to undercount. I have already mentioned the IDC study that quantified the amount of data in existence. however, they forgot the tsunami of digital information....
With glee, IDC sizes the digital universe in 2008 at 487 billion
gigabytes. People are taking pictures, making phone calls, sending
emails, blogging, and putting up videos on YouTube. Enterprises are
capturing daily transaction records and adding to their data
warehouses. The amount of security-intensive information is on the
rise. Governments are requiring more information be kept and protected,
forcing the migration to digital TV, and taking surveillance photos of
their citizens. A continuous gush of gigabytes springs into being:
according to IDC, the binary data created last year would have filled
30 billion Apple iPod Touches.