Recently I bought a pen drive from online store. It is an 8 GB pen drive.
Step 1: Description on the Back
On the backside you can see its an eight GB pen drive.
Step 2: When I Insert Pen Drive in Computer
You can clearly see it shows 7.21 GB free of 7.21 GB. So what about 8 GB?? What happened to 0.79 GB?? We will understand in next step.