Today, we will enlighten you about the different SD card standards that exist in the market. The Secure Digital (SD) card was first launched back in 1999. At the moment, SD cards come in various form factors, capacity types, speed classes, bus interfaces, etc. Let’s break down and explain each of these classifications.
1. Form Factor
After the first SD card was introduced in 1999, the smaller version miniSD card came out in 2003. Two years later in 2005, an even smaller microSD card was released. Nowadays, miniSD cards are rare because most devices use either standard size SD cards or microSD cards.
2. Capacity Type
All form factors of micro SD Cards come in a variety of capacity types. The first capacity type is the Secure Digital(micro SD) which supports cards of up to 2 GB in capacity. Next comes the Secure Digital High Capacity (SDHC) type for cards supporting over 2 GB and up to 32 GB of storage. After that, we have the Secure Digital Extended Capacity (SDXC) cards which offer storage capacity between 32 GB and 2 TB ..
In June 2018, the SD card association announced a fourth capacity type called Secure Digital Ultra Capacity (SDUC). This new SD card standard supports cards from as low as 2 TB all the way up to 128 TB . 128 TB is a mind-blowing quantity of storage in something the size of a fingernail.
SD card capacity standards
64GB microSDXC UHS-I Samsung EVo plus micro SD Card
3. Speed Classes
(a) Write Speed Class
Most SD cards are labeled with up to three different types of speed classes which indicate the minimum sequential write speed that a card is capable of. The initial SD card speed classes were class 2, class 4, class 6, and class 10, with the number appearing in the letter C. These classes indicate minimum write speeds of 2 MB/s, 4 MB/s, 6 MB/s, and 10 MB/s respectively.
Next to be introduced was the Ultra High Speed (UHS) class. This classification indicates if a card can sustain sequential write speeds of either 10 MB/s or 30 MB/s. The labeling is done by placing number 1 or 3 inside the letter U.
(b) Video Speed Class
Of late, SD cards are also getting labeled with video speed classes. The video speed class of a card can be identified by the numbers 6, 10, 30, 60, or 90 appearing after a letter V. These video speed classes indicate minimum sustained write speeds of 6 MB/s, 10 MB/s, 30 MB/s, 60 MB/s, and 90 MB/s respectively.
4. Application Class
It’s also worth noting that some SD cards are labeled with an application performance class. The application class can be either class 1 which is denoted as A1 or class 2 which is denoted as A2. Here, the minimum sustained write speed is 10 MB/s which is similar to a class 10, U1, or V10 card.
Additionally, A1 and A2 cards are also certified for the minimum number of Input-Output operations Per Second (IOPS). High IOPS values are important where an SD card is used in a computer to run an operating system or to store applications. This is a practice that is becoming increasingly common.
5. Bus Interfaces
SD cards also come with several different bus interface standards. Bus interface standards relate to the speed that electronics use to transfer data. These are interface hardware specifications, which are quite distinct from the SD card speed class. At least in theory, right now, there are four different SD card bus interface standards.
The bus interface standards are High-Speed, UHS-I, UHS-II, and UHS-III. These offer potential maximum data transfer speeds of up to 25 MB/s, 104 MB/s, 312 MB/s, and 624 MB/s respectively. Normally, all you see indicated on a card is a single Roman numeral. Most modern SD cards are labeled with I or II to indicate they possess either a UHS-I or UHS-II bus interface.
It is important to note that UHS here stands for Ultra-High-Speed, which is just an SD card’s bus interface specification that is entirely distinct from its UHS speed class. SD cards with either a High-Speed or UHS-I bus interface communicate data over 1 row of contact pins.
To achieve higher data transfer speeds, UHS-II and UHS-III cards require a second row of connectors. This means that it’s very easy to distinguish cards with a slower bus interface from those with a faster one by just by turning them over. Today, if an SD card has two rows of pins, that means it has a UHS-II bus interface.
That is because the faster UHS-III standard which uses the same dual-pin layout is exceedingly rare to find. UHS-III is also very unlikely to go mainstream because in June 2018, a new standard was added to SD card standards called SD Express .
6. SD Express
This too has two rows of contact pins with the upper one maintaining a UHS-I bus interface for backward compatibility. The lower row of pins offer a PCIe Gen 3 bus interface with NVMe protocols .
The latter promises maximum data transfer speeds of 985 MB/s. The SD express standard can be used in the place of regular SSDs. This comes with potentially major implications for the size and design of many different categories of computers and IoT devices .
At the moment, most single-board computers have their operating system stored on an SD card, this may become increasingly common in the future.
George Kimathi a tech writer based in Kenya, passionate about exploring how technology shapes everyday life across Africa. From mobile innovations to digital trends, he covers the tools and ideas driving the continent’s digital transformation. When not writing, George enjoys testing gadgets, exploring local tech communities, and staying curious about what’s next.
Type your email…
Talkio Mobile , Uganda’s newest telecommunications service provider, is excited to announce a groundbreaking partnership with Banana Life Investments, a leading chain of mobile phone and retail shops. This strategic alliance aims to bring Talkio’s innovative telecom services closer to Ugandans.
This collaboration will leverage Banana Life Investments’ extensive retail network of 26 stores strategically located across Uganda in major malls, towns, and cities to provide customers with unparalleled convenience. Through this partnership, Talkio Mobile will offer its full suite of services, including SIM cards, airtime, and exclusive product offerings at any Banana Life Investment location.
This partnership is more than a business initiative—it’s a shared commitment to transforming lives. By integrating Talkio Mobile’s forward-thinking services & nationwide reach with Banana Life Investments’ retail footprint, the two brands are setting a new standard for customer convenience and inclusivity.
READ ALSO: 5 Things You Need to Know About Talkio Mobile: New Telecom Company in Uganda
“This partnership aligns perfectly with our mission of connecting Ugandans to innovative and transformative telecom solutions,” said Vianne Allan Ahura, CEO of Talkio Mobile. “By leveraging Banana Life Investments’ trusted presence and nationwide footprint, we are not only expanding our agent network but also bringing our services closer to the communities we serve. This collaboration ensures that our online customers can now enjoy a seamless offline experience right at their doorstep. Together, we are empowering Ugandans with the tools they need to stay connected, grow their businesses, and unlock new opportunities.”
Solomon Ssemuyaba, the assistant general manager at Banana Life Investments, echoed this sentiment: “We are proud to join hands with Talkio Mobile to deliver innovative, customer-centric solutions. This partnership represents our shared vision of fostering a connected future for Uganda. Together, we are redefining what convenience and accessibility mean for our customers.”
The partnership goes beyond retail distribution, introducing joint initiatives aimed at value addition and personalized service. Customers can expect seamless access to:
- SIM Card Sales : Available at all Banana Life Investments locations.
- Talkio phone number bookings : Book your preferred Talkio number at any Banana Life Investments location.
- Airtime Services : Recharge easily through in-store purchases.
- Customer Support : Friendly and knowledgeable staff trained to assist with Talkio Mobile products and services.
Additionally, the two companies plan to launch promotional campaigns and expand services to even more locations, ensuring no Ugandan is left behind in the digital transformation.
Solomon Obwot is a tech writer based in Kampala, Uganda, with extensive experience in the local tech startup ecosystem. He covers the latest news and analysis on consumer tech, writes in-depth smartphone reviews, and conducts insightful interviews with industry experts. Solomon is also a passionate podcaster, sharing his knowledge and engaging in discussions about Africa’s rapidly growing tech landscape. Send emails to [email protected]
Type your email…
The Mobile World Congress (MWC) Barcelona , the world’s largest exhibition for the mobile industry, has just concluded. This annual event gathers leading technology brands to unveil groundbreaking mobile, AI, and digital solutions innovations. At MWC 2025, TECNO showcased a range of AI-driven products, reinforcing its commitment to cutting-edge technology.
The key launches included:
- CAMON 40 Series – AI-powered smartphones with One-Tap FlashSnap and advanced mobile imaging features.
- MEGABOOK S14 – The world’s lightest 14-inch OLED laptop, featuring AI-enhanced multitasking and Snapdragon® X Elite.
- MEGABOOK T14 Air & K15S – Lightweight ultrabooks with AI capabilities and extended battery life.
- TECNO AI Glasses Series – Smart eyewear integrating AI imaging, translation, and AR display.
Jan Stryjak, Associate Director at Counterpoint Research, shared, “In the past year, we have observed significant advancements in the field of AI. AI will continue to drive transformative changes in our daily lives. In this critical period for the economic development of emerging markets, TECNO’s AI technologies are unlocking potential for diverse needs.”
“The application of AI technologies is crucial and urgent in emerging markets. We’re committed to bridging the digital gap between emerging and mature markets,” said TECNO CMO, Laury Bai. “TECNO is taking a practical approach to make AI more accessible, ensuring users in emerging markets can access AI and cutting-edge technologies.”
Laury Bai, TECNO CMO
Driven by its commitment, TECNO has forged a robust partnership with MediaTek, establishing a joint AI laboratory dedicated to accelerating advancements in AI. At the event, James Chen, Vice President of Product and Technology Marketing at MediaTek, emphasized, “The synergistic R&D efforts between TECNO and MediaTek are set to democratize AI technology. Our collaboration powers a seamless, interconnected AI experience, bringing users a future of truly connected intelligence.”
James Chen, Vice President, Product and Technology Marketing at MediaTek
CAMON 40 Series Powered by AI One-Tap FlashSnap Revolutionizes Smartphone Snapshot Photography
TECNO’s Global Product Launch Officer, Olivier Mas, officially unveiled TECNO’s next-generation AI-driven products. Attendees at TECNO’s launch event witnessed the highly anticipated debut of TECNO’s new CAMON 40 Series, a device that embodies TECNO’s legacy of excellence in mobile imaging. Featuring One-Tap FlashSnap Mode and TECNO AI, the series sets a new benchmark in smartphone photography, delivering exceptional snapshot capabilities and AI-enhanced user experiences.
Olivier Mas, TECNO Global Product Launch Officer
The CAMON 40 Series exemplifies a commitment to innovation that transcends hardware and software, extending into strategic partnerships that deliver cutting-edge AI solutions to emerging markets. Matt Waldbusser, Managing Director of Global Solutions and Consumer AI at Google Cloud, remarked, “Our collaboration with TECNO on the CAMON 40 Series is a standout example. Leveraging Google Cloud’s capabilities, we’ve introduced groundbreaking features such as Ask Ella, AI Image Generator, AI Writing, and AI Translate. I am particularly impressed by the industry-leading and competitive edge of some of these innovations. For instance, TECNO’s AI supports text translation in 136 languages, voice translation in 44 languages, and photo translation in 51 languages. We are excited to further strengthen our partnership with TECNO, unlocking limitless potential to bring advanced yet practical AI capabilities to emerging markets in a convenient and secure manner.”
Matt Waldbusser, Managing Director of Global Solutions and Consumer AI at Google Cloud
The CAMON 40 Series’ innovative One-Tap FlashSnap leverages AI to enhance imaging capabilities, revolutionizing mobile photography. AI optimizes camera startup and continuous shooting for instant captures, while AI-powered multi-frame processing intelligently reduces noise and enhances details, delivering sharper, more refined images. Additionally, the BestMoment algorithm analyzes motion patterns, automatically selecting the optimal frames for precise, high-quality shots in dynamic scenarios, ensuring users an unparalleled mobile imaging experience.
TECNO CAMON 40 Demonstrates the Cutting-Edge FlashSnap Capability
To delve deeper into the imaging prowess of the CAMON 40 Series, TECNO invited Frédéric Guichard, CEO of DXOMARK, to share the image performance of CAMON 40 Pro. Frédéric highlighted, “The CAMON 40 Pro 5G has demonstrated exceptional imaging and performance capabilities in our rigorous evaluations. We’ve been particularly impressed with photo performance being the best for devices under 600$, and the 1st eligible device to our Smart Choice Label.”
Onsite photo of Frédéric Guichard, CEO of DXOMARK
Beyond its advanced rapid-capture functionality, the integration of TECNO AI further enhances the device’s capabilities. Intelligent imaging, a 360° AI Call Assistant, and productivity tools elevate creativity and efficiency. Powered by MediaTek’s latest chipsets, the series ensures smooth performance, fast processing, and extended battery life. With a sleek, durable, and water-resistant design, it seamlessly blends style with practicality for modern users.
MEGABOOK S14, the World’s Lightest 14-inch OLED Laptop, Inspires Creators and Game Lovers
The MEGABOOK S14 is TECNO’s first OLED laptop and the industry’s lightest 14-inch OLED laptop, featuring a 2.8K OLED display and incredibly weighing only 899g (31.7oz). The laptop is equipped with the outstanding power of the Snapdragon® X Elite compute platform, the flagship chipset for AI PCs from Qualcomm Technologies, and integrates TECNO’s world’s first self-developed edge-side large-scale AI model, to achieve AI-enhanced multitasking.
World’s Lightest 14-inch Laptop MEGABOOK S14
Specifically designed for next-gen AI productivity, TECNO AI enhances the Ella AI Assistant, AI-powered PPT generation, AI-driven image search, smart albums, and offline meeting transcription with multilingual support. The External Graphics Dock, equipped with a powerful NVIDIA graphic card, delivers scalable, high-performance capabilities for design, gaming, and content creation. The laptop’s 2.8K OLED display with a 120Hz refresh rate ensures exceptional visuals, while DTS:X Ultra dual 2W speakers, Wi-Fi 6E, fingerprint login, and PC Manager optimize connectivity and user experience.
TECNO’s strategic partnership with Qualcomm Technologies was a highlight of the TECNO AI Ecosystem Product Launch event, demonstrating a shared vision for the future of AI PCs. Kedar Kondap, SVP & GM of Compute and Gaming at Qualcomm, took the stage to discuss the integration of Qualcomm’s cutting-edge PC chipset into the new MEGABOOK S14 laptop, underscoring TECNO’s commitment to delivering high-performance computing solutions.
Kedar Kondap, SVP & GM of Compute and Gaming at Qualcomm
In addition, TECNO also introduced several standout new products. The featherlight 999g (35.2oz) ultrabook MEGABOOK T14 Air, features high-speed storage and LPDDR5 memory, while the ultra-thin, all-metal MEGABOOK K15S, equipped with a powerful 70Wh battery and supported by a 65W PD GaN charger, offers a smarter and more long-lasting user experience. Both devices are empowered by TECNO AI with advanced AI capabilities such as AI Album and AI Voice Assistant, making them perfect companions for all aspects of life.
The Next Game-Changing Tech Innovation: See the World with the TECNO AI Glasses Series
TECNO’s new AI Glasses Series also took center stage with the introduction of TECNO AI Glasses Pro and TECNO AI Glasses, reimagining eyewear with cutting-edge imaging, intelligent interactions, and a sleek aesthetic. The TECNO AI Glasses feature an aviator design, while the Pro model showcases a browline style, both embodying timeless elegance and modern fashion.
TECNO AI Glasses Redefine the Way People See the Future
Equipped with a 50MP high-definition camera, the series integrates an OV50D sensor, a 100° ultra-wide-angle custom lens, and an AI ISP imaging chip, forming a mobile-grade imaging system. This system lets users capture stunning, high-resolution photos with advanced AI noise reduction and HDR capabilities. With real-time translation supporting over 100 languages, TECNO AI’s Ella empowers accurate translation even for less common languages, as well as voice control, AI-powered object recognition, and intelligent information summaries for ultimate convenience.
Additionally, the AI Glasses Pro features a MicroLED display with 7th-gen resin waveguide technology, offering a 30° field of view, over 1,500 nits of brightness AR display, and a lightweight, ultra-thin design. The AR display allows users to effortlessly enjoy features like translation display, navigation, information prompts, and teleprompting.
Equipped with a 250mAh battery, these glasses offer over 11 hours of music playback and 8 hours of mixed use with just 30 minutes of charging. An advanced ultra-linear speaker, bass enhancement, and spatial sound deliver an immersive audio experience, while Wi-Fi 6 and Bluetooth 5.4 ensure seamless connectivity.
With these innovative launches, TECNO is setting new standards in mobile imaging and AI-enhanced technology, shaping a more connected and empowered future for consumers in emerging markets. Once again, TECNO has showcased its cutting-edge innovation on the global stage at MWC. With the brand essence of “Stop at Nothing”, TECNO’s relentless pursuit of innovation is making AI-powered technology more accessible, allowing consumers to experience the future ahead of time.
Solomon Obwot is a tech writer based in Kampala, Uganda, with extensive experience in the local tech startup ecosystem. He covers the latest news and analysis on consumer tech, writes in-depth smartphone reviews, and conducts insightful interviews with industry experts. Solomon is also a passionate podcaster, sharing his knowledge and engaging in discussions about Africa’s rapidly growing tech landscape. Send emails to [email protected]
Type your email…
