HDD is a storage device (storage) that record data quickly becomes magnetic pulses on a platter / disc rotating metal.
When a CPU is the brains of a PC, then the hard drive serves as the heart, pumping vital data to the entire system. As a component that drives the virtual computer, the hard drive is also something mysterious. Most people can not see the inside of a hard drive, obstructed by aluminum cover, though perhaps people are very familiar with the files and programs are stored, copied, moved, and deleted from your hard drive.
The hard drive provides data storage in which all modern computers need it. A hard drive stores information by placing a magnetic field through the surface of a disk coated magnetic material moving around.
The main principle of a hard drive is the use of magnetism to store information. A hard drive stores digital data as magnetic point on the surface of a disk. A bit (composed as a bit of your data) suggests a value of 0 when the disk is magnetized in one direction, and the value 1 if the opposite direction.
Each individual in a hard disk drive is named as a platter (plate / metal disks). A large-capacity hard drives usually contain some 3.5-inch diameter platter and use both sides as a storage medium. Drive itself has a motor that rotates at a speed of 4500 to 15,000 rotations per minute.
Hard drives use a recording device called the head to write and read data from any surface of the platter. Drive to position a head, use an arm that can move, with a microscopic distance above the surface of the platter on each side. So for the hard drive that has five platter will have ten heads that depend on ten motor arm.
Other elements in the head reads the data recorded by sensing the magnetic field on magnetic mentioned every bit as it passes through the element is read.
How hard drive works
When an operating system sends data to your hard drive for recording, the drive is processing the data using a complex mathematical formula that adds an extra bit in the data. Bit it did not take place: In the future, when the data is taken, these extra bits allow the drive to detect and correct errors caused by random variation of the magnetic field inside the driver.
Then, the drive is moving the head through the appropriate track from the platter. Time to move the head is called the "seek time". While at the top right track, the drive to wait until the platter spins up to the desired sector under the head. The amount of time is called "drive latency". The shorter the time seek and latency, the faster the drive completed its work.
When the electronic components of the drive determines that a head is above the appropriate sector to write data, the drive sends electrical pulses to the head. Pulse generates a magnetic field that changes the magnetic surface on the platter. Variation that is now representing a recorded data.
Reading the data requires some process of recording. Drive to position the reader of the head above the appropriate track, and then wait for the right sector to rotate on it. At a certain magnetic spectrum that represent your data in the appropriate sector and track just above the head reader, electronic components drive detects tiny changes in magnetic field and convert it to bits. When the drive is over in check process and correct errors in bits if necessary, it then sends the data on the operating system.
Almost all HDD that you purchase have already had a low-level format. It is not necessary, therefore, to perform a low-level format yourself unless you want to change the interleave factor or make the hard drive accessible by a different type of hard drive controller. Performing a low-level format erases all data on the hard drive.