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Memory Card & Reader

Nowadays, the era of convenience and speed has made technology and electronic devices developed very fast. Whether mobile phones, cameras, video cameras, etc, they are all built to meet the needs of ours. Talking about photos and videos taking with high resolution to get a clearer picture, one of indispensable camera parts is "Memory" that is used to store the photos or videos. There are many types of memory but the well-known one is memory card and card reader. 

Memory cards and card readers are one of memory storage media that users can save data without using batteries, no data loss when switching off, and high speed data transfer. The part used for recording data in the memory card is called solid state chips. It uses electrical processes to record data with built-in read and write reader controls. Memory cards can be divided into several types including: 

Smart Media Card or SMD. It was developed in 1995 by Toshiba with the body size of only 0.2 mm. It was considered the smallest and most slim memory card of those days. They tried to reduce production costs in order to make it more affordable. However, it has a disadvantage which is no built-in drivers. Therefore, it is impossible to expand as much capacity as other devices. And because of this, SMD is limited to the use on compatible devices only.
xD Card (xD-Picture Card). It was produced mainly for digital cameras including Olympus, Fujifilm, and Kodak. The capacity of the xD card is from 16, 32,  64, 128, 256, 512MB, and 1GB. If the capacity is 16 and 32MB, the data reading speed is 5Mbps and the data writing speed is 1.8Mbps.  The xD card with a capacity of 64, 128, 256, and 512MB will have a reading speed of 5Mbps and the data writing speed is 3Mbps. Lastly, if the xD card has a capacity of 1GB, the speed of reading data is 4Mb while the writing speed is 2.5Mbps.

And the last type of memory card which we have commonly seen is SD Card Or Secure Digital Card. It is one of flash memory types that is regularly used in various types of small mobile devices, including mobile phones, digital cameras, or PDAs. The SD Card is developed based on the MMC Card (the basis for working on NAND-based flash memory). SD card shares the same width and length with MMC card which is 32 mm in length and 24 mm in width but a little but thicker. Toshiba has added hardware capabilities that encrypt data into the original technology of MMC card and also added a special technique called DRM (Digital Rights Management) which is information copyright management. Moreover, on the side of the SD card, there is a switch for preventing written data from being overwritten. However, the SD card still has some disadvantage compared to the MMC card such as the loss of unused data space. For every 64MB of SD card, the data loss rate will be approximately 1.5MB while the MMC card in every 64MB, it will have only about 0.5MB data loss rate. The loss rate difference is three times.

SD card memory is one of the most widely used today, whether they are digital cameras, music players, MP3 players, or video cameras. It can be divided into several types. So it is important to select SD card that is compatible with your devices. Many people would have encountered a problem when got a new device but the SD card is not compatible with the device making the device unusable, slow, or hang. All of this is because the SD card has a different class to be compatible with each application.