There’s also a whitepaper providing more details about the new features and SD Express Speed Classes defined by SD 9.1.Ĭard vendors producing SD Express memory cards will want to support this specification and communicate the minimum assured performance of an SD Express Class, allowing customers to know which card will best fit their camera, drone, VR, gaming console, etc. SDA has provided several whitepapers explaining how easy it is to add SD Express to virtually any host device. Implementing an SD Express interface requires a hardware update of the host SD interface. Consumers only need to match the host device with the right card to enjoy the best possible experience. The SD Express Speed Class Pictographs indicated will be used on an SD Express memory card, packaging and in a device manual to clearly indicate its Speed Class. The table below describes each SD Express Speed Class and minimum data transfer rate of the corresponding SDXC/SDUC or microSDXC/microSDUC memory cards. These SD Express Speed Classes were created to meet the requirements of any applicable host device or products that require minimum writing performance using the PCIe/NVMe interface offered by SD Express such as with real-time video recording. SD9.1 has introduced new SD Express Speed Classes 150, 300, 450, and 600. With the introduction of SD Express cards and its PCIe/NVMe interface, there was a need to adapt the existing Video Speed Classes to operate over NVMe. As NAND technology advanced, the access methods have changed and the last speed class spec defined is the known Video Speed Classes used over the SD UHS-I and UHS-II interfaces. It also allows host manufacturers to optimize their hosts by using the defined access methods to the card. The consumer market has found the speed classes as useful means for product manufacturers to tell consumers which speed class is required to allow proper operation of their features and at the same time, help consumers identify the right card to use for their device. In addition, the SD 9.1 specification defines new SD Express Speed Classes over the PCIe/NVMe interface, supporting multi-stream recording along with new associated features that allows optimized Power and Thermal Management control while assuring the minimum assure speed class performance. The SDA recently introduced several innovations and new features, including doubling the microSD Express memory card speed up to 2GB/s, using PCIe Gen4 interface, as defined in the microSD Addendum version 8 specification. By having performance levels, such as transfer speeds up to 4GB/sec thanks to the use of PCIe® and NVMe® architectures, the SD Association (SDA) is ensuring that full-size SD and microSD form factors will continue to be the leading removable memory cards for consumer, industrial and other professional markets well into the future. The SD Express specification represents a quantum leap in possibilities for the integration and use of removable storage in high-performance electronic devices and products. New SD Express Specifications Introduce New Speed Classes and Next-Level Performance Featuresīy: Yosi Pinto, Chairman of the Board, SD Association
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