DISK DRIVE

Disk drive is a machine that reads data from and write onto a disk. Disk drive rotates the disk with precise timing and has one or more read/write heads that read  and write  data. The data is read by the read/write head and  transferred to the computer's  main memory for further processing. There are different types  of disk drives  for different types of disks e.g. a hard disk drive (HDD) reads and writes hard disks, and  a floppy disk drive (FDD) accesses  floppy disks, and an optical disk drive reads  optical disk. Disk drive can be either internal ( house within the computer) or external (house in a separate box that connects to the computer.

MICROPHONE

Microphone is an input device used to digitally record audio data , such as the human voice. It can be plugged into a computer or recorder. Many productivity applications can accept input via a microphone, enabling the user to dictate text  or issue  commands orally. Software in the computer converts the sound  impulses into  digital form. It is then stored in memory and processed when  required.