MicroSD Express Specification Released: Speed comparable to SSD, up to 985MB/s

According to the news on February 26th, less than a year after the SD Express specification was released, the SD Association announced the microSD Express specification at the MWC2019 conference yesterday, introducing the PCIe 3.1 bus and the NVMe 1.3 interface protocol into the traditional microSD card, which will use the second-row pin of the UHS-II card to enable the NVMe v1.3 connection.

Like SD Express cards, cards that support the microSD Express specification can provide speeds of up to 985MB/s.
By comparison, the fastest UHS-I card has a maximum speed of 100 MB/s and the fastest UHS-II card over 300 MB/s, both which are far less than the microSD Express card.
The microSD Express card defined in the SD 7.1 specification will provide a variety of capacities, such as microSDHC Express, microSDXC Express, and microSDUC Express.
In fact, because of the low-power substate (L1.1 and L1.2) that supports PCIe v3.1, microSD Express cards will use less power than traditional microSDs, although they are much faster than the latter. In addition, the Express standard is well suited for multitasking, so there is no performance penalty for moving applications to external storage. In order to achieve this goal, microSD Express card draws on some technologies from PC SSD, including multi-queue support, host memory buffer, bus control and so on. The bad news, however, is that the microSD Express standard requires additional UHS-II pins, and currently there are no mobile phones that support UHS-II cards. Though, perhaps handset makers will eventually upgrade their microSD slots in the near future. Note, however, that the microSD Express card will be backward compatible with existing microSD slots, but will lose NVMe speed.
Summary：With the vigorous development of big data industry, storage technology is also increasing. Recently, the SD Association announced the microSD Express specification at the MWC2019 conference, and cards supporting the microSD Express specification will have higher reading and writing speed, larger storage capacity and lower energy consumption. This will be a major development of storage technology, let's wait and see.