How much physical space is required for the Internet?

There are many ways to estimate the amount of information contained on the web, but we can set the upper limit of the interesting, just having estimated how much disk space (as an example) we bought.
Storage industry produces about 650 million hard drives a year. If most of them - 3, 5 "wheels, which means that produced eight liters (2 gallons) per second hard drive.

This means that the last few years the production of hard disk drives due to ever-increasing volumes of media is a big part of the global storage system, we only fill the oil tanker. Thus, based on the calculations, the Internet is less than the oil tanker