SD Card Reader

SD Cards (Secure Digital Cards) are a popular form of portable flash memory storage because of it’s small size , speed and durability. It’s used widely in digital video/photography to store media, and as expansion storage for other smart devices including phones , tablets etc.

It was created by a group of companies and has now become a standard for portable data storage.

SD Cards

SD Card readers are devices that allow for SD Cards to be read by the computer system and can be internal (built into) or externally connected via USB ports.

Below: An external SD Card Reader with an inserted Micro SD Card

SD card reader

Below: An internal SD Card Reader built into the computer’s system unit.

Toshiba Satellite S40t laptop - SD card reader - 10086954974

Why are SD Card Readers needed?

Because of it’s widespread use, it has become desirable to include SD card readers in newer computer systems to facilitate easier data transfer from device to device.

A common task that a user would face would be copying their media from their digital camera to their pc. In the past, this meant that the user would have to install the camera’s software and drivers on the pc, then connect a cable from the camera to the pc to access the media.

This process changes when a sd card reader is built in or connected to a computer, the user simply removes the sd card from the digital camera and inserts it into the sd card reader, where the media is immediately accessible as using any other portable secondary storage device.

Attributions to media used in this post

Original: 毛抜きDerivative work: Tkgd2007, CC BY-SA 3.0, via Wikimedia Commons

Dineshkumar Nallaveerappan, CC BY-SA 4.0, via Wikimedia Commons

liewcf, CC BY-SA 2.0, via Wikimedia Commons

© 2023  Vedesh Kungebeharry. All rights reserved. 

Screen size and resolution


Screen sizes are measured along the diagonal of the screen and is usually quoted in inches. For example, a typical computer monitor or laptop screen may be 15” in size.

Display size measurements


Screen resolution refers to the quality and level of detail that can be displayed on the screen. The screen is made up of a matrix of individual dots that can be coloured  differently.  Each dot is know as a picture element or pixel for short.

Example of pixels. Shows a zoomed section of an image to demonstrate how it is made up of pixels.

Maximizing the number of dots in a unit area of the screen will result in a sharper image with more detail , or as we say, a  higher resolution image.

A monitor’s screen resolution is denoted as horizontal pixels x vertical pixels. e.g 1920 * 1080

How does Size and Resolution relate to each other?

It’s possible for a monitor with large screen to have a small resolution, to the average person, the screen may display images which are blocky, where the pixels are discernable and the image is not smooth.

It’s also possible to have a very small screen have a high resolution, as in the case of a high end smartphone.

Size and resolution consideration depends on where the screen needed, for example, having a large screen with a low resolution at a train station or airport is feasible since a lot of people can easily view the screen at once , however , we do not require the need to display detailed images, just formatted text or cursive fonts.

Haneda-Airport-T2-STA Monorail-Gate-LED

On the other side of the spectrum, a graphic artist travelling on a long train ride may opt to get his/her/them/they/us work done on a portable tablet computer which has a small but very high resolution stylus touch screen to allow for fine and detailed designs to be viewed while being created.

T-FLEX CAD - Коллективная работа

Attributions to media used in this post:

florisla, CC BY-SA 2.0, via Wikimedia Commons

ed g2s • talk, CC BY-SA 3.0, via Wikimedia Commons

MaedaAkihiko, CC BY-SA 4.0, via Wikimedia Commons

TopSystemsLTD, CC BY-SA 4.0, via Wikimedia Commons

© 2023  Vedesh Kungebeharry. All rights reserved.