The SD Association announced the emergence of SD Express, a new standard that brings the PCI Express 3.0 interface and the NVMe 1.3 protocol to SD cards. The PCI Express interface guarantees a maximum data transfer rate of 985 MB / s, while the NVMe protocol allows advanced access mechanisms. Together they offer new capabilities such as Bus Mastering, Multi-Queue and Host Memory Buffer.
According to the president of SD Association, Hiroyuki Sakamoto, “SD Express offers a whole new level of memory cards with faster protocols that transform cards into a removable SSD .” Thanks to the speed of the PCI Express will be able to move large amounts of data collected for example by capturing videos at 8K resolution, but also photos and videos at 360 degrees and much more.
The association explains that the SD Express cards use the same pins and connectors defined for the current SD UHS-II, with the first row which is also an SD UHS-I interface, so as to ensure complete backward compatibility with billions of devices that support SD. The maximum speed will, however, be obtained on devices that natively support SD Express.
The SD 7.0 specification defines a “full size” form factor that uses two power supplies (3.3 and 1.8 volts), but there is also the 1.2-volt option to support future formats. More information in this whitepaper. Initially, SD Express will be offered on SDUC, SDXC, and SDHC memory cards.
The newly introduced SD 7.0 specifications also extend the maximum capacity of 2TB up to 128TB SD cards with the new SD Ultra-Capacity (SDUC). When there are actually devices on the market that support SD Express cards, and when the memory cards come on the market, is not yet known.
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