Alternatively referred to as a hard disk drive and abbreviated as HD or HDD, the hard drive is thecomputer’s main storage media device that permanently stores all data on the computer. The hard drive was first introduced on September 13, 1956 and consists of one or more hard drive plattersinside of air sealed casing. Most computer hard drives are in an internal drive bay at the front of the computer and connect to the motherboard using either ATA, SCSI, or a SATA cable and power cable. Below, is an illustration of what the inside of a hard drive looks like for a desktop and Laptop hard drive.
As can be seen in the above picture, the desktop hard drive has six components: the head actuator,read/write actuator arm, read/write head, spindle, and platter. On the back of a hard drive is a circuit board called the disk controller