Below given is the architecture and working of a hard drive:
Architecture: A hard disk drive contains several metal plates which rotate at a speed of typically 10,800 rpm. A mechanical arm spins on these metal plates which has the read and write head.
Working: A region of a plate for which a read and write head can read data at any given position is known as a track. Every track is divided in to a number of sectors. All tracks for a particular position of an arm are known as a cylinder. To read or write data in the disk, first the cylinder is located. After that the specific track to which the data is read or to be written is located. Finally the sector is located for writing and reading data. When a sector is located, data can be read or written at a speed of 160 MB/s.