How do the hard disks record information?

Explanation

The correct answer is Magnetisation. Explanation: Magnetic storage is one of the most affordable ways to store large amounts of data. Magnetic storage uses the two types of magnetic polarities to represent the binary information consisting of zeros and ones. Magnetic storage devices store data by magnetizing particles on a disk or tape. Commonly used devices that use magnetic storage include magnetic tape , floppy disks and hard-disk drives . The hard disk is a spindle of magnetic disks , called platters, that record and store information. Because the data is stored magnetically, information recorded to the hard disk remains intact after you turn your computer off. An example of a hard drive is the location on a desktop computer where a person could save their research paper. IBM made the first commercial hard disk drive-based computer and called it RAMAC – short for “Random Access Method of Accounting And Control.”