What is a SD Memory Card?

SD card is the abbreviation of Secure Digital Card, which is directly translated into Chinese as "Secure Digital Card". It is a new memory card product jointly developed by Japanese and American companies.

SD memory card

SD card is short for Secure Digital Card.

SD memory card is a completely open standard (system), with multiple MP3, digital cameras

There are many SD card brands on the market, and well-known brands have their own characteristics.

The SD card has a small body. Generally, consumers will not know much before buying, so it is difficult to distinguish from the appearance. The following is a method to identify the authenticity of SanDisk SD cards commonly used in the market. In itself, sandisk genuine memory cards have laser color changing labels on the front, and laser color changes will occur at different angles. Secondly, the domestic licensed genuine cards are all packed in a similar plastic packaging, but the words "5-year guarantee" in the lower right and Japanese have been changed to the 5-year warranty indicated by the graphic.

In addition, the simplest identification can be made from whether there is a gap on the bottom of the SD card. Since the number on the back of the original SanDisk SD card is unique, and you can check the authenticity through 800 phone, it is said that this query system has not it is good.

Figure 1. The yellow part in the red circle is the write-protect switch of the SD card. It is itself a small piece of plastic that can be moved up and down. (Due to affecting the distance between text and picture, delete in Figure 1)

In Figure 2, the green line is a contact switch in the camera. When the card is inserted into the camera, the yellow part just presses the switch of the camera to close the contacts, and the two-point AB circuit is turned on.