** hard-disk-drive ** (HDDs) are a type of non-volatile storage device used to store and retrieve digital information in computers and other electronic devices. Here's an overview of HDDs in English:
What are Hard Disk Drives?
Hard Disk Drives, often abbreviated as HDDs, are the traditional spinning disk data storage devices that have been a standard component in computers for decades. They are also known as "hard drives" or simply "drives".
Working Principle of HDDs
The data is stored magnetically on the platters. When a computer needs to read data, the read/write head moves to the correct location and reads the magnetic patterns on the platter's surface. To write data, the read/write head changes the magnetic patterns on the platter, which represents the data.
Data Storage Density
HDDs have seen significant improvements in areal density, allowing more data to be stored in the same physical space. This is achieved by reducing the size of the magnetic grains on the platter surface and improving the precision of the read/write heads.
Interfaces and Form Factors
HDDs come in various form factors, such as 3.5-inch for desktop computers and 2.5-inch for laptops and some external drives. They use different interfaces for data transfer, including SATA, SCSI, and older interfaces like IDE and PATA.
In summary, Hard Disk Drives are a mature technology that continues to be widely used due to their high storage capacity and cost-effectiveness, despite the rise of Solid State Drives (SSDs) which offer faster performance and durability.
