Development trend of SD card

The SD card specification was proposed by the SD Association, which is composed of Panasonic, Toshiba and SanDisk. Therefore, the United States and Japan have always been in the lead in SD card technology. Micro SD card and standard SD card adopt the same specification. In the SD 3.0 specification proposed in 2009, the SD Association proposed the uhs-i (ultra high speed generation 1) speed standard. The SD card can support a reading and writing speed of 104mb / s under this speed standard. At the same time, it also proposed a new generation standard SDXC card for SD cards, which increases the maximum capacity of SD cards from 32GB to 2TB, so that SD cards can meet the development needs of the big data era. In the 4.10 specification proposed in June 2013, uhs-ii speed standard was proposed, which raised the theoretical reading and writing speed of SD card to 312mb / s, so that SD card can meet the requirements of high-speed data transmission. Therefore, SD card has broad application prospects in future development.

Lexar, a famous memory card manufacturer in the United States, has produced a developed SD card with a capacity of 256g and a reading and writing speed of 60MB / s. The super speed SD card supporting the sd3.0 specification produced by SanDisk of the United States can reach a reading speed of 95MB / s and a writing speed of 90MB / s. at the same time, it also produces corresponding high-speed card readers. In May 2014, it launched the supreme super speed SD card supporting the sd4.0 specification, with a reading speed of 280MB / s and a writing speed of 250MB / S. in the PC interface, USB2.0 has become its bottleneck, The USB 3.0 interface must be used to give full play to the performance of the high-speed SD card reader and SD card. But at present, this kind of high-speed SD card has not been widely used in automatic test systems. In China, only a few Taiwan enterprises such as Weigang and Guangying Dentsu produce SD cards, and the reading and writing speed of SD cards is also at the level of about 90MB / s. They have not been able to produce SD cards that support the uhs-ii speed standard proposed in the sd4.0 specification, which lags behind the foreign generation. The ultra fast SD card technology and market are mainly controlled by the United States and Japan.

With the development of science and technology, we have entered the era of big data, and memory cards are also developing towards greater capacity and higher speed. In industrial applications, from the previous VXI bus to PXI bus architecture, light and compact devices are becoming more and more popular. At present, small volume, large capacity data storage and high-speed transmission have also become the bottleneck of many solutions. Therefore, in order to adapt to the development of the times, the SD association has also proposed new specifications one after another, so that SD cards can support larger capacity and higher transmission rate, And strive to improve micro SD technology of micro size.