What is HDD? - Explained

What is HDD? - Explained

Image by Daniel LWS Nimmervoll in Flickr under Creative Commons Category.

There were multiple types of storage devices that used several stages of the computer generations. Storage devices which does have the possibility of read and write data are more valuable.


What is HDD?

HDD stands for Hard Disk Drives. From the early stage computers in multiple generations, there were multiple types of storage devices used which made out of magnetic drums and tapes.

The name HDD says more about what actually is a HDD. HDD is a electromagnetic storage type which uses disks which record data electromagnetically. HDD introduced by IBM in 1956 as a secondary storage device. 

Why secondary storage device? the HDD devices are not that speed to read and write data and make them a primary storage device like RAM. Due to the nature of HDD, it cannot perform in such high speed like RAM

HDD uses disks made by alloy and keep uses laser point sized needle type tool read and write data into the disks. The HDD needs to perform a mechanical operation to perform like it's designed. The disks inside the HDD needs to be rotate at high speed per minute and the data reading pins with arms needs to go to the specific places in the hard disk drive and read the data which needs to be read and write.


Device TypeSize in Inches
Desktop & Server3.5
Laptops2.5

The global standard for HDD does carry two sizes. 3.5 Inches and 2.5 Inches as mentioned in the above table.

Specs and the performances of a hard disk drive matters extremely. The speed of disk rotation and the data transfer speed and data read and write speed extremely important to perform the computer run smoothly. Manufactures offer multiple spec hard disk drives to cater different types of computer systems.