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the CPU. They are not as fast a RAM.

Types of hard disk

Internal Hard Disk Drive: It is placed inside the system unit and
stores the operating system of the computer as well as other programs
and user files.
External Hard Disk Drive looks and works almost like the internal
one but is connected outside the system unit through a cable. The
external hard disk drive is portable and can be carried from one
computer to another.

Parts of Hard Disk Drive
Platter: Platter is a circular, metal disk that is mounted inside a hard

disk drive to store data. Each platter can store data on both sides of the
platter. The more the platters, the larger the storage capacity of the
drive.
Spindle Motor: The Spindle motor is the motor that turns the platters.
Many hard drive failures occur due to spindle motor not functioning

properly.
Actuator: An actuator is an electronic device controlled by a motor
that moves the hard drive head arm.
Read/Write Heads: The heads convert the information, which is in the
form of bits to magnetic pulses when it is to be stored on the platter and
reverses the process while reading.
Logic Board: The logic board is an intelligent circuit board integrated

into the hard disk unit. Drive Bay: Drive Bay is an enclosure designed
to protect the hard drive from the outside air, dust and other
contaminants.
Ribbon cable: The ribbon cable is the flexible wire that link read/write
heads to the logic board.