Hard disk drive (HDD), computer hard drive
A hard disk drive (HDD) is a device that stores or reproduces data in a desired storage location by moving its magnetic head to the desired location in a head load state. The hard disk drive (HDD) is standard equipment for personal computer, server or industrial computer. An hard drive is provided with headers for signal transmission as well as power connector for receiving power from a switching power supply mounted within a computer. A computer hard disk drive typically includes one or more rotatable storage media, or disks upon which data is encoded. The disks are mounted on the shaft of a spindle motor for rotation. Data is encoded on the rotating disks as bits of information using magnetic field reversals grouped in tracks. Hard disk drives contain a plurality of magnetic heads that are coupled to rotating disks. The heads write and read information by magnetizing and sensing the magnetic fields of the disk surfaces. Each magnetic head is attached to a flexure arm to create a subassembly commonly referred to as a head gimbal assembly (HGA). A transducer head supported by an actuator arm is used to read data from or write data to the disks. The head gimbal assemblies are suspended from an actuator arm. The actuator arm has a voice coil motor that can move the heads across the surfaces of the disks. The disks are rotated by a spindle motor of the disk drive. A voice control motor (VCM) attached to the actuator arm controls positioning of the actuator, and thus the transducer head position over a disk. Servo position data read from the disk is processed by the processor, enabling the processor to provide servo control signals to the VCM for proper positioning of a transducer head relative to a disk. Hard disk drive units include a magnetic disk that is capable of storing a large amount of binary information. The magnetic disk is typically coupled to a hub that is rotated by an electric motor, commonly referred to as a spindle motor. The primary function of a spindle motor controller is to regulate the commutation of the spindle motor, which in turn controls the rotation rate of the spindle motor. This rotation rate is controlled by an external hard disk drive controller which provides the spindle motor controller with a digital demand code indicative of a desired rotational rate of the motor. The actuator arm, motors and other components of a typical disk drive unit are relatively small and fragile, and are therefore susceptible to damage when subjected to excessive external shock loads or vibration. For this reason, hard disk drives are usually rigidly mounted to the housing of the computer system by screws or other fastening means. Generally, the HDD is electrically connected with a motherboard of the computer by means of a signal cable assembly and a power cable assembly interconnected between the motherboard and the switching power supply.
Hard disk drive (HDD), computer hard drive categories
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