Understanding What A HDD Is And Its Purposes

hard disk drive

A computer is not complete without hard disk drives. Just like the human body and the brain, the machine can’t function well without these devices. A hard disk drive or HDD is a non-volatile storage mechanism for various types of data and is the core storage of a computer. Programs and other applications for modern computers are kept in an HDD. While HDD holds data very much like previous devices such as cassette tapes, they are actually far more innovative and convenient than other similar mechanisms.


Many people confuse hard drive and RAM. RAM is a volatile memory, and the data is lost when the power is turned off. The hard drives retain stored data even when there is no power. A hard drive was made in the 1950s which hold up only megabytes. HDD consists of thin discs, magnet, heads, and circuit. The design of the hard drive has seen many changes over the past decades.


The hard drives are made up of platters of a magnet where data is stored. The platter has various layers made up of different materials. The interior layer is made up of iron oxide which is generally called the magnetic layer. The magnetic layer is covered with carbon layer to make the hard disk durable. The outer layer has a lubricant which facilitates movement of the head. To store data, spindles, motors, controllers, actuator, and heads are used together. The data to be stored is put onto magnetic platters which are read later when requested by you.

Hard drives are quite small. On one side, there is a panel of electronics that detaches from the rest of the hard disk. These electronics controls the read and write functions and the motor that spins the platters, which we will get into in a bit. It is electronics work to turn the magnetic domains into bytes for reading and to return those bytes into magnetic domains for writing.


Data is stored on each platter surface. The pattern looks similar to a pie as a computer uses sectors and tracks to store information. Tracks have a concentric shape while segments look like pie wedges. Sectors are also finite in the number of bytes each can store, which is typically either 256 or 512 bytes and are therefore often stored in clusters on the platter.

Hard Disk Drives purpose

Hard drives today have a storage space of 320 GB to 2 TB and have a speed of 5400 to 7200 rpm (rotations per minute). HDD with a larger memory space and speed allows the user to save more files and located them within seconds. They are very useful to people who are working on computer applications, animations or photo editing.

A computer Hard Drive is where all the data is stored when a computer is off. Hard drives use magnetism to decode and store any computer data and such; it doesn’t need any electrical power to retain or remember all the data.

The information is transferred in binary bits, and HDD incorporates and interprets changes in the magnetism of the transmitted data. As a result, the hard drive can decode and keep your files. This is accomplished through the several complex parts contained in every hard disk drive. Each of this parts part has its own role in storing your data. Platter, the main component of HDD’s used for data storage, is the disk-shaped section in the middle of the device. HDD’s also contain spindles which read and write data from the platter. Now that you know exactly what a HDD is, you can make an informed purchase.

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