How do Hard Disk Drives Work?
Most basic hard drives are made up of numerous disk platters, which are circular disks composed of aluminum, glass, or ceramic that are arranged around a spindle inside a sealed chamber. The platter is spun by a motor attached to the spindle. The chamber also contains the read/write heads, which use a magnetic head to record information to and from tracks on the platters. The disks are additionally covered in a thin magnetic coating.
The platters rotate at up to 15,000 rotations per minute by the motor. A second motor regulates the location of the read and write heads that magnetically record and read information on each platter as the platters rotate. The compartments that store the data can be spread out all over the hard disk.
Hard Disk Drive (HDD) Secondary memory
Primary memory has limited storage capacity and it is volatile. Secondary memory overcomes this limitation by providing permanent storage of data in bulk quantity. Secondary memory is also termed external memory and refers to the various storage media on which a computer can store data and programs. The Secondary storage media can be fixed or removable. Fixed Storage media is an internal storage medium like a hard disk that is fixed inside the computer.