SD卡已经成为目前消费数码设备中技术最成熟、应用最广泛的一种存储卡,具有大容量、高性能、安全、读写速度快等多种优势。回顾SD存储卡的发展历程可见,其存储容量越来越大,已经达到了64GB,很快还可以达到128GB甚至更大的容量。另一方面,随着视频压缩技术的发展,视频监 SD card has become the most mature and most widely used memory card in consumer digital devices at present. It has many advantages such as large capacity, high performance, security, read and write speed, and so on. Review of the history of SD memory card can be seen, its storage capacity is growing, has reached 64GB, and soon can reach 128GB or more capacity. On the other hand, with the development of video compression technology, video surveillance