Assignment:
A hard disk contains four Platters. Each side of the platter is coated with a magnetic oxide, allowing data to be stored on it. The platters are 3.5 inches in diameter. If the hard disk has a capacity of 800 GB and 80% of the platter surface is used for data storage, what is the bit density per square inch?
Provide complete and step by step solution for the question and show calculations and use formulas.