হার্ড ড্রাইভ কিভাবে কাজ করে?

Can you believe that modern hard drives hold 300,000,000 times more information than IBM’s first device from 1957? Nowadays they can easily hold more information than any library, and their capacity is still increasing. But how do they store such huge amounts of data? In this TED-Ed video, Kanawat Senanan explains how these powerful tools were created.