Adata has become one of the first companies to support the V90 video speed class with its Premier ONE series of SD cards that guarantee 90MB/s sustained read and write: the key specification for stable video capture.
Fast UHS-II cards already exist, promising around 290MB/s peak write speed, but these are often rated as U3 speed, meaning they don't guarantee to be able to reliably write for extended periods at anything over 30MB/s. This means you're taking a risk if you try to shoot with a camera that writes any faster than this (240 megabits per second).
The V90 speed class, announced in 2016, promises three times that performance, allowing up to 720MBps capture. The latest cards are also some of the first to rely on 3D NAND technology, one of the approaches that will be needed to allow cards to get larger and faster.
The ADATA Premier ONE UHS-II cards will be available in 64 GB, 128 GB and 256 GB configurations in SDXC and microSDXC form-factors. The new memory cards are rated for up 275/290 MB/s sequential read speed as well as up to 155/260 MB/s sequential write speed, depending on the capacity and form-factor (the microSDXCs are a slower). The Premier ONE UHS-II cards are also compliant with Video Speed Class V90 specification, which mandates minimum write speed of 90 MB/s to smooth recording of UHD and 360° video. The enhanced performance of the new SD products by ADATA is enabled by 3D MLC NAND memory with large block and page sizes as well as a new controller (which I suspect uses some kind of pSLC technique to ensure fast writes, but that has not been confirmed by ADATA). In addition to performance-related improvements, the controller also supports write-in protection as well as ECC. To take full advantage of the new cards, one will need a device that fully supports the UHS-II interface and has the extra pins the wider bus requires. Still, the cards are compatible with all types of SD-supporting devices (cameras, card readers, etc.) albeit at lower speeds.
Another important selling point of the ADATA Premier ONE UHS-II cards is their rugged design. The SDs are explicitly adverised as being both waterproof and dust-proof. Meanwhile, the cards are also rated to work at extended temperature range between -25°C to 85°C, which makes them suitable for industrial applications.
