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What is Hard Disk Drive (HDD)? How it works?

What is Hard Disk Drive (HDD)? How it works?

What is hard disk
Hard Disk Drive
Nowadays everybody will be using computers, and stores its own data in hard disk drive. But most of people don't know what is Hard Disk Drive and How it works. So in this article we have to explain about Hard Disk Drive (HDD). 

What is Hard Disk Drive?

A Hard Disk Drive, or HDD is a long-term memory storage devices for a computer. An HDD is a physical disk or platter with a magnetic coating on which data can be stored. A solid state drive (SSD) is a device that has no moving parts (a spinning platter) and is also able to store data. A SSD is very similar to a USB or flash drive.

In other term: The hard drive is a way to store your data. Your RAM holds the information for what you’re working with right now, but the issue with RAM is that it’s a volatile form of memory, which means that it loses all of the information it holds the moment it loses power. This is where Hard-drives come in. They store all the files in your computer and maintain said files up until you delete/overwrite it OR until it breaks. That’s really all I can say about your hard-drive, it’s there to store your files. It’s slower than RAM, but comes in a larger quantity and maintains that information up until you break it/ remove said files or overwrite them.

Advantages of Hard Disk Drive:

1. Higher storage capacity than SSD: Another advantage of a hard disk drive is that this storage system is available at varying storage capacity options—usually at a higher base capacity than SSD. 500GB HDDs have now become a standard storage capacity for computers and external drives. The availability of more computers and external drives sporting 1TB HDDs is promoting a new standard for storage capacity. On the other hand, compared with an HDD, computers or devices that use an SSD storage system have a base capacity of 128GB.


2. More affordable than SSD: One of the primary advantages of a hard disk drive is that it is more affordable than SSD in terms of dollar per gigabit. An SSD with a storage capacity similar with an HDD can be twice as expensive. This means that desktop or laptop computers with hard disk drives are considerably cheaper than counterparts sporting an SSD storage system. External HDDs are also cheaper than external SSDs.

3. HDD is easier to buy in most stores: There is an abundance of internal or external hard disk drives in the market. Individuals who want to upgrade their computers or want to buy an external media storage to backup their data would find it more convenient to oft an HDD instead of an SSD. However, devices using SSDs are becoming more popular as well and the technology involved in producing this HDD counterpart is becoming more efficient. This could mean that SSDs can have the same availability in the immediate future.

Disadvantages of Hard Disk Drive:

1. HDD is slower than SSD: Different variants of hard disk drives have different read and write speeds—depending on their respective RPM or rotation per minute specification. It is worth emphasising that solid-state drives are faster than HDD. A computer with an HDD storage system will boot slower than SSD. In addition, because an HDD is prone to fragmentation of data because of its rotary recording surface, it is inherently slower than fragmentation-free SSD.
2. Higher power consumption: Another disadvantage of a hard disk drive is that it consumes more power than SSD. The storage device basically needs more power input to rotate the metallic platter and move that magnetic read head. The implication of this is that manufacturers would instead opt for an SSD for computers that are more compact or that have limited batter capacity.
3. Produces noise while in operation: The spinning of the metallic platter and the back-and-forth movement of the magnetic read head create mechanical noises while a hard disk drive is in operation. Both spin and movement also create subtle vibrations. This is more noticeable during boot or whenever a user is storing large files. SDD is essentially noise-free.

 Hows Works Hard Disk Drive:

Hard disks Drive were invented in the 1950s. They started as large disks up to 20 inches in diameter holding just a few megabytes. They were originally called "fixed disks" or "Winchesters" (a code name used for a popular IBM product). They later became known as "hard disks" to distinguish them from "floppy disks." Hard disks have a hard platter that holds the magnetic medium, as opposed to the flexible plastic film found in tapes and floppies.

At the simplest level, a hard disk is not that different from a cassette tape. Both hard disks and cassette tapes use the same magnetic recording techniques described in How Tape Recorders Work. Hard disks and cassette tapes also share the major benefits of magnetic storage -- the magnetic medium can be easily erased and rewritten, and it will "remember" the magnetic flux patterns stored onto the medium for many years.
  
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