Business Wire

microSD Express Doubles Speeds, New SD Express Speed Classes Introduced


SD Association (SDA) today announced the latest evolution of SD Express memory cards doubling microSD Express memory card speed up to 2GB/s, plus four new SD Express Speed Classes to ensure guaranteed minimum sequential performance levels in the new SD 9.1 specification including support of Multi-stream access and related Power and Thermal Management assuring the guaranteed performance. SD 9.1 helps consumers identify the right card for their device while giving manufacturers new tools to assure minimum level of performance of SD Express memory cards and have means to guide consumers what type of cards will assure specific application operations.

This press release features multimedia. View the full release here:

To view this piece of content from, please give your consent at the top of this page.

SD Express Speed Classes (Graphic: Business Wire)

The latest generation of microSD Express uses the PCIe interface delivering a 1,969 megabytes per second (MB/s), nearly 2 gigabytes per second (GB/s) speeds by using the PCIe Gen4 x1 lane as defined in the latest update to the microSD Addendum version 8 specification. microSD Express was introduced with 985 MB/s speed maximum data transfer rate and the NVMe upper layer protocol in the SD 7.1 specification. The increase in speed gives product designers more storage options and SSD level performance for a variety of size constrained devices requiring easily repairable or upgradeable storage.

The SD Express Speed Classes are used exclusively on SDXC, SDUC, microSDXC and microSDUC memory cards offering the SD Express bus. Changes in memory technology necessitate the need to define speeds as NAND flash technology continues to evolve. SD Express is the most significant evolution for SD since it was introduced in 2000. It meets new and evolving market needs to support increased performance requirements of controllers, memories, and other application interfaces. SD Express can fully support almost every use case demanding higher speed removable or semi-removable memory cards and is ideal for meeting the growing number of Right to Repair laws.

“By defining minimum assured sequential performance standards for SD Express memory cards, the SDA helps both device manufacturers and consumers ensure the best recording and playback of all types of content,” said Hiroyuki Sakamoto, SDA president. “We doubled the speed of microSD Express to 2GB/s to give product manufacturers more storage options capable of handling the most demanding storage uses making SD Express memory cards a compelling, ecologically sound choice making it easier to repair and upgrade devices.”

New Features

In order to optimize the SD Express speed class usage under various power levels and thermal conditions - Leveraging NVMe specifications, SD Express memory card now offer several Power Management settings through Maximum Power (MP) values. The card consumes power up to one of the MP values set by the host device to manage card temperatures. SD Express memory cards use a new Thermal Management feature where the card indicates a group of its specific thermal thresholds. The host device may then set appropriate Thermal Management parameters for the card according to the target class and the selected PCIe bus mode, much like an MP value for power management.

The SD 9.1 specification defines the access rules required to ensure the minimum defined performance of the PCI/NVMe interface in SD Express cards, including multi-stream access of up to eight streams.

The SDA has prepared a whitepaper providing more details about the new features and SD Express Speed Classes defined by SD 9.1.

SD Express

A growing list of devices and memory cards support SD Express. SD Express offers SSD performance levels with transfer speeds up to ~4GB/sec thanks to the PCI Express® (PCIe®) and NVMe Express™ (NVMe™) architectures. The first SD Express cards were introduced with SD7.0 specifications for the full-size SD form factor supporting PCIe Gen 3 x1 interface with speeds of 985 MB/s. SD8.0 defines three additional PCIe interfaces – PCIe Gen 4 x1, PCIe G3 x2 and PCIe Gen4 x2 quadrupling speeds to 4GB/s. SD7.1 specification added SD Express 985 MB/s to the microSD form factor and the microSD Addendum version 8 specification doubled speeds to 2 GB/s by using PCIe Gen 4 x1. SD Express gigabyte transfer speeds bring new storage opportunities for devices with demanding performance levels capable of moving large amounts of data generated by data-intense wireless or wired communication, super-slow motion video, RAW continuous burst mode and 8K video capture and playback, 360 degree cameras/videos, speed hungry applications running on cards and mobile computing devices, ever evolving gaming systems, multi-channel IoT devices and automotive to name a few.

SD Association

The SD Association is a global ecosystem of nearly 800 technology companies charged with setting interoperable SD standards. The Association encourages the development of consumer electronic, wireless communication, digital imaging and networking products that utilize market-leading SD technology. The SD standard is the number one choice for consumers and has earned more than 80 percent of the memory card market with its reliable interoperability and its easy-to-use format. Today, smartphones, tablets, drones, IoT devices, HDTVs, audio players, automotive systems, computers, digital cameras and digital video cameras feature SD interoperability. For more information about SDA or to join, please visit the Association’s website,

SD logos are trademarks licensed by SD-3C LLC.

PCIe® - PCI Express, is a standard developed by PCI-SIG® and PCIe® is a trademark owned by PCI-SIG.

NVMe™ - NVM ExpressTM, is a standard developed by NVM Express Inc. and NVMe™ is a trademark owned by NVM Express Inc.

To view this piece of content from, please give your consent at the top of this page.

Contact information

Kevin Schader
SD Association

About Business Wire

Business Wire
Business Wire
24 Martin Lane
EC4R 0DR London

+44 20 7626 1982

(c) 2018 Business Wire, Inc., All rights reserved.

Business Wire, a Berkshire Hathaway company, is the global leader in multiplatform press release distribution.

Subscribe to releases from Business Wire

Subscribe to all the latest releases from Business Wire by registering your e-mail address below. You can unsubscribe at any time.

Latest releases from Business Wire

Lenovo’s New All-in-One, AI-Powered Solution with Microsoft Simplifies Security and Removes the Need for Multiple Vendors6.12.2023 12:00:00 CET | Press release

Lenovo and Microsoft are working together to help organizations operate more securely across their devices, users, apps, data, networks, and cloud services through a subscription-based Cyber Resiliency as a Service (CRaaS) offering. The offering enables Lenovo to build next generation security solutions and services directly on Microsoft technology including Microsoft Azure, Microsoft Defender, and Microsoft Sentinel to simplify security deployments and enhance security posture to help prevent, detect, and recover from potentially disruptive cyber events. This press release features multimedia. View the full release here: Top Challenges Faced by CIOs (Graphic: Business Wire) CRaaS addresses growing security challenges for businesses of all sizes. Lenovo’s global annual survey of CIOs found that data privacy/security (68%) and cybersecurity/ransomware (68%) are the top two challenges businesses find most difficult to address.1 Wi

International Sustainable Forestry Coalition Welcomes New Member, Suzano6.12.2023 11:37:00 CET | Press release

In September a group of leading global sustainable forestry companies launched the International Sustainable Forestry Coalition (ISFC), to enable the sector to positively contribute to global policy processes focused on the transition from a fossil-based economy to a circular bioeconomy. Today the ISFC is delighted to announce that Suzano, one of the world’s major forestry sector companies, has become a member. Suzano, headquartered in Brazil, is a globally respected forestry sector leader. With almost a hundred years in operation, the company manages extensive sustainable timber plantation estates and forest conservation areas, and creates a vast range of fibre-based products. One out of every three tissue products used in the world today will have come from Suzano’s operations. Convening Chair of the ISFC Dr. David Brand said, “With the inclusion of Suzano in the ISFC, the group represents more than 12.6 million hectares (31 million acres) of forests for conservation and production i

Forrester: European Retail Sales To Reach €2.7 Trillion By 20286.12.2023 11:00:00 CET | Press release

Forrester (Nasdaq: FORR) forecasts that total retail sales of Europe-5 countries (France, Germany, Italy, Spain, and the UK) will increase from €2.3 trillion in 2023 to reach €2.7 trillion in 2028 at a 2.9% compound annual growth rate (CAGR). Forrester’s recently released report, Europe-5 Online Retail Forecast, 2023 To 2028, estimates total retail sales, online retail sales, and online retail penetration across 22 product categories, including fashion, homeware, food and drink, consumer electronics, and media, for each of the Europe-5 economies. Germany holds the largest share of the retail market among these five countries, followed (in order) by the UK and France. In 2022, offline retail growth outpaced online retail growth for the first time as more consumers shopped in stores, and this momentum continued into 2023, but the fundamental growth drivers of online retail such as greater product selection, round-the-clock availability, and competitive pricing remain strong. As a result,

Kaneka Acquires Japan Medical Device Technology6.12.2023 10:40:00 CET | Press release

Kaneka Corporation (Headquarters: Minato-ku, Tokyo; President: Minoru Tanaka)(TOKYO:4118) has acquired all shares of Japan Medical Device Technology Co., Ltd. (Headquarters: Kamimashiki-gun, Kumamoto; President: Shuzo Yamashita) (hereinafter JMDT), a developer and manufacturer of medical devices, on November 30, 2023, and made it a wholly owned subsidiary. This press release features multimedia. View the full release here: Stent before expansion (Photo: Business Wire) Kaneka manufactures and sells endovascular catheters, which are devices used in the treatment of cardiac, peripheral vascular, and cerebrovascular diseases. In particular, stenting*1 for the treatment of coronary artery diseases such as atherosclerosis has a market worth 30 billion yen in Japan, and Kaneka is aiming to expand its business in this area. JMDT has high technological capabilities in the research and development of coronary stents and is one of the lead

CommBox launches Era AI to enable customer service to be intelligently automated and CX costs to be cut by 40%6.12.2023 10:00:00 CET | Press release

Today CommBox, the pioneer in AI-powered customer communications, is launching its new generative AI solution. Designed for medium to large businesses across a range of industries including healthcare, banking, retail, telecommunications and insurance, Era AI is based on a winning combination of both proprietary technology developed by CommBox and commercial large language models. Era AI’s functionality scans enterprise knowledge sources and, in just seconds, provides customers with accurate, highly personalised information through the digital messaging channel of their choice. Era AI delivers customer service automation, reduces costs for organisations, and dramatically increases the speed and accuracy of enquiry handling. It does this all while increasing customer satisfaction, with CommBox customers seeing a 92% customer satisfaction rate on average. Central to this is Era AI’s ability to analyse a brand’s entire resource base, such as support articles, help and knowledge centres, a