What is a hard disk? Everything you need to know about Hard disk
Hard disk is an important component of many computers. This device stores programs and data regardless of whether the computer is turned on or not. Data on a hard disk must be stored for years without interruption, but this is considered semi-permanent storage because there is no complete or permanent digital storage system.
Here’s what you need to know about hard disk:
How hard disk work on a computer
Hard disk traditionally uses a set of rotating metal plates. Each drive has a head that uses magnets to read or write data as needed to quickly move the entire disk back and forth. The platter needs to be completely sealed inside the hard disk enclosure to protect it from fine dust, but if you can see the hard disk, it’s just a small phonograph record player with a tonearm.
Perhaps more precisely, a hard drive looks like a stack of small phonographs. This is because virtually every hard drive consists of a set of platters. Each platter can only hold a certain amount of data. Therefore, hard drive manufacturers are increasing capacity by placing the platters on one drive.
Although this description accurately describes hard disk drives (HDDs), solid-state drives (SSDs) are often referred to as hard drives. Therefore, in general, a hard disk is a mechanical storage device based on a rotating platter, but informally, a hard disk can refer to a hard disk or solid-state drive.
Solid-state drives have completely replaced computer hard drives, making it increasingly difficult to find traditional hard drives on modern PCs.
Hard disk advantages and disadvantages
First of all, the hard disk was an early relic. And the best way to store large amounts of data is to use mechanical systems with moving parts. The hard disk is virtually the only remaining moving part of modern computers (with the exception of laptop hinges and power buttons). This increases the likelihood of component failure and has a significantly shorter average failure interval (MTBF) than any other part of the computer.
However, the risk is worth it. A hard disk can store large amounts of data at a very low cost. This usually results in a low value for money. The lifespan of a hard disk is also “sufficient” in most situations, as it is usually measured in several years. For more information, see the article Comparing Hard Drives to Solid State Drives.