HOW DO HARDDRIVES WORK

Hard drive:
Data storage device that uses magnetic storage to store and retrieval digital information.

                              

Also known as:
Hard drive, Hard disk, Fixed drive, Fixed disk, Fixed disk drive.

Invention:
In 1956, by Reynold B. Johnson.

Where it present:
In CPU.

What does it do:
Store all our programs, pictures, music, videos, operating system on hard drive.

How it stores data:
Form of 0 and 1.

How is data read and write on hard drive:
Magnetized to store 1.
Demagnetized to store 0.

Magnetism:
Storing information.

Demagnetism:
Removing information.

Working:
Magnetic platters:
Information is stored and retrieved from platters concentric circles called tracks, broken in to segments called sectors.

Platter:
Round magnetic plate of hard disk.
computer starts platters began to rotate.

Arm:
Piece sticking out over the platters.
Read and store magnetic information to platters.
To read and write data off it.

Motor:
Spin platters from 4,500 to 15,000 rotations per minute.
  

Actuator:
Device controlled by motor that moves head arm.

Jumper block:
Flowing electricity.
Conductor used to open, close or bypass of an electronic circuit.

Spindle:
Allows read write arm to swing across platter.

First hard disk:

Why it is called hard drive:
Made of metal.
Platters in it are hard.
Today's are fixed hard drives.

Fixed:
Do not have removable platters.

Largest capacity hard drive:
2.5 inch solid state drive can hold 16 terrabytes of data.

External hard disk drive:
Extra storage devices with high storage capacities.

Use of external hard drives:
Backing up files.

Types:
IDE:
Integrated drive electronics.
Also known as PATA drives (Parallel Advance Technology Attachment).
Connecting mother board to storage devices like hard drives.

SATA:
Serial Advance Technology Attachment.
Transferring data from hard disk to computer system.
 

SATA cable connected to hard drive and mother board

SCSI:
Small Computer System Interface.
Pronounced as scuzzy.
Connecting peripheral devices to computer.

Peripheral:
Devices such as keyboard, mouse, printer.

SAS:
Serial Attached Small Computer System Interface.
Low storage capacity.
Used for servers.
Costly.
Cable 10 meter long.

Advantages:
Large storage capacity.
Easy portability.

Disadvantages:
crashes data will lost.
High power consumption.
Noise.