The Full Form of HDD is Hard Disk Drive. HDD is a non-volatile data storage device. Non-volatile storage or Non-volatile memory (NVM) means a type of computer memory that can retrieve stored information even after having been power cycled, in other words volatile memory needs constant power in order to retain data.
In a computer or laptop, HDD is commonly used as the main storage device. HDDs often store the operating systems, software programs and other files. Hard Disk Drive does store data magnetically, so the read performance remains steady, regardless of where the data is stored on the drive.
More than 224 companies are producing HDDs historically, though most units are manufactured by Western Digital(WD), Toshiba, Samsung, Seagate and Sony. Because Solid-state drives (SSDs) have higher areal storage density, much lower latency & access times, better reliability and higher data-transfer rates, the sales revenues and unit shipments of HDD are declining.
On December 24, 1954 Hard Disk Drive(HDD) was invented IBM(International Business Machines Corporation) team led by Rey Johnson.
Full Form of HDD is : Hard Disk Drive
HDDs capacity and performance :
Capacity is specified to powers of 1000,as follows:
- a 1-terabyte (TB) drive has a capacity of 1,000 gigabyte(GB)
- where 1 gigabyte(GB) = 1 billion bytes
In desktop, the highest-capacity HDDs had 16 TB in late (2019).
|Capacity advertised by manufacturer||Reported capacity|
|100GB||93.1 GB(for Windows)|
100GB(for Mac OS)
|1TB[1,000 GB]||931 GB(for Windows)|
1,000 GB(for Mac OS)
Factors for modern HDDs :
- 3.5-inch, for desktop computers
- 2.5-inch, primarily for laptops
Hard Disk Drives (HDDs) are connected to systems by standard interface cables such as Universal Serial Bus (USB) , Serial Attached(SAS), SATA (Serial ATA) or PATA (Parallel ATA).
HDD Types :
- External Hard Disk :- connect to our computer via a USB or FireWire connection
- Internal Hard Disk :- installed within the body (laptop) or tower (desktop) of your compute
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