This used to be more important when memory cards were generally much slower, but these days while you’ll still come across it on some modern cards, it’s largely unhelpful. Speed Class has been effectively replaced by either UHS Speed Class or Video Speed Class, and either is going to be better to determine the capability of a card. UHS Speed Class Boasting read speeds of up to 300 MB/s and write speeds of up to 299 MB/s, the Sony SF-G Tough UHS-II SD Card is currently the fastest and most expensive UHS-II SD card on the market. Perfect for continuous shutter bursts, rapid shooting and 8K, 6K, 4K video recording, this card is ruggedly designed to handle drops of up to 16.4′ / 5m, immersion in up to 16.4′ / 5m of water for up to 72 hours, and is dust, X-ray, magnet, and anti-static proof, as well as resistant to UV light and temperature extremes from -13 to 185°F.

The History of the CFast 2.0 Memory Card - VMedia The History of the CFast 2.0 Memory Card - VMedia

This is the more modern version of the Speed Class, with virtually all existing SD cards fitting into one of two UHS Speed Classes — either U1 or U3. These are denoted by either the number 1 or the number 3 within the letter “U” — usually found somewhere near the Speed Class. Most cards are going to be U3, which indicates a minimum write speed of 30 MB/s. Video Speed Class Just two months later on August 31ˢᵗ2017, theShenzhen based electronics company Longsys announced that it had acquiredthe Lexar trademark and branding from Micron ¹². The Future of the CFast Card If you’re in the market for an SD card with speedy read/write times, a reasonable cost, dependable construction, and a lifetime guarantee, look no further than the Kingston Canvas React Plus UHS-II SD card – we highly recommend it!CFexpress Type B offers an excellent blend of value, capacity, quality, and — particularly — speed. While the insanely fast read and write speeds are of little value to photographers who don’t shoot sports or wildlife, they still aren’t too offputtingly expensive, especially if your second slot is UHS-II SD. Video Performance Guarantee enabled to support cinema-quality 4K video recording at 130MB/s minimum sustained write speed. The humble SD card has found its way to most of the digital cameras on this planet. With its small size, high capacities and relatively low cost, it’s pretty easy to understand why. But, SD is not always the right tool for the job. Especially when the needs are for a much higher capacity and faster speeds. That’s where CFast comes in. An Early Prototype of CFast Card (via WikiMedia Commons) Evolving Needs for Data The Lexar Professional 3500x CFast 2.0 Memory Card is an exceptional and beloved choice for your CFast 2.0 needs, boasting lightning-fast read speeds of up to 525 MB/s and write speeds of up to 445 MB/s. With it, you can easily capture 4K and even RAW, ProRes, and other content – no sweat! Offering 64GB, 128GB, 256GB, and 512GB storage capacities, this card comes with a Limited Lifetime Warranty for your peace of mind. Another card manufacturer that has performed well and actual now also tests on their BMPCC4K I believe are the Angelbird cards.

CFast Cards - Swissbit CFast Cards - Swissbit

Don’t worry about CFexpress Type C quite yet. No camera uses it and no manufacturer is producing on the standard yet. VPG 400 Utilizing top-quality 3D NAND Flash and rated to endure 3K P/E cycles, Transcend's microSDXC 460T memory cards combine the advantages of high performance and exceptional endurance at an affordable price. They are ideal for write-intensive applications such as medical devices, surveillance systems, and POS terminals. I bought six of them for my 12K shoot and they worked great. I've got some OG sandisk ones and they're just getting a bit old now. Professional videographers trust SanDisk CFast cards to keep up with the high demands of the cinema, broadcast and media industries. Get the most out of your professional camera with the high performance, capacity, and reliability of a SanDisk card.With SD cards, we want to look at several attributes: Photo from the SD Association SDHC Versus SDXC https://petapixel.com/2014/01/07/lexar-announces-cfast-2-0-card-claims-worlds-fastest-memory-card-title/