Here's an interesting page which gives you some idea of how much data the values in multiples of Bytes mean:
Whenever we discuss quantities of data, we tend to do it in the abstract. We speak of a kilobyte, or a megabyte or a gigabyte without really knowing what it represents.
The following table shows various quantities of bytes, in each power of ten. Usually, they are shown with multiples of 2 and 5 also. For example, 1 Kilobyte, 2 Kilobytes, 5 Kilobytes.
here's the one i personally find most interesting:
5 Exabytes: All words ever spoken by human beings.
For more info on how MB,TB,EB, etc relate, check This wikipedia page
Found through StumbleUpon