What is HD?
HD is an acronym whose meaning may refer to “High Definition” or “Hard Disk”.
HDTV is a feature of television sets that receive digital signal and feature high resolution picture.
The format of these TVs is widescreen (16: 9), unlike analog TVs that have the 4: 3 aspect ratio.
The HDTV standard is used on HD Ready or Full HD TVs. The difference between the two is the detailing of the image. While the HD Ready has 1366 x 768 pixels, the Full HD reaches 1920 x 1080 pixels, presenting a complete resolution of the image.
The hard disk is the permanent memory of the computer and stores all information that is saved by the user, as well as the operating system’s own applications.
HD is also called “secondary memory”. It is physical and non-volatile memory. It is different from “RAM” exactly by saving the information even when the computer is turned off.
The hard drive is a device with great capacity of data storage and that comes incorporated to the computer.
The external HD, connected to the computer via a USB port, is a very popular alternative for storing all types of data: music, movies, photos, backup, etc.