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The SD Association has announced the SD 5.0 standard, which will specify memory cards with write speeds capable of recording 8K and 360°/VR video:
The SD Association, the multi-vendor consortium responsible for developing standards for Secure Digital flash memory cards, has unveiled the newest version of the Secure Digital standard, SD 5.0. The latest iteration of the standard has been released specifically to accomdate video capture, particularly the write speeds needed to record 8K (7680x4320) and 360° videos. To that end, the upcoming SD 5.0 memory cards will introduce the Video Speed Class labeling, as well as a newer protocol that takes into account new NAND flash architectures, enables higher transfer rates and supports multi-file recording.
In order to address the needs for video, the new standard will be tackling both transfer rates and the overall nature of writes with video recordings. The new standard does not introduce a new bus - the current UHS-II bus supports over 150MB/sec in full duplex mode, more than any SD card can currently handle - but rather the focus is on the cards themselves and how they behave.
In particular, the SD 5.0 standard takes into account the fact that recent, high capacity NAND flash chips feature larger block sizes (the smallest area of NAND flash memory that can be erased in a single operation) than previous-gen chips. For example, SK Hynix recently released planar MLC and TLC NAND ICs (integrated circuits) with 6 MB page and 9 MB block sizes, whereas upcoming 3D NAND flash from Intel and Micron will feature 16 MB (MLC) or even 24 MB (TLC) block sizes. Erasing a group of larger blocks takes less time than wiping out a huge number of smaller blocks, which is why larger blocks enable faster write operations, something that is needed to build memory cards for UHD video capture.
The Video Speed Class standard includes a set of 37 block sizes that range from 8 MB to 512 MB, which should be sufficient for the foreseeable future. In addition, the SD 5.0 VSC protocol supports simultaneous interleaving of eight different files, which is useful for 360° videos, multiple independent video streams, or even numerous high-quality still pictures taken at the same time.
The new standard adds new write speed classes of 60 MB/s and 90 MB/s. The fastest former class was UHS Speed Class 3, which specified a minimum of 30 MB/s write speed to allow 4K video recording. The whitepaper lists a 120 FPS frame rate for 8K video recording.
SD Association press release (PDF) and whitepaper (PDF).
(Score: 2) by Rich on Wednesday March 02 2016, @02:41PM
Was about to rant about the stupid marketing blurb and just gave the whitepaper a skim. Upside: A "Vxx class" now describes actually in megabytes per second ("xx") how fast sustained writes can be. Downside: The card specifies very large block sizes (e.g. in the 10s or 100s of Megabytes) that have to be written sequentially. Looks like they want to skimp on buffering and controller effort and rather directly expose the silicon architecture instead.
As I understand, this means that there are little to no gains for "ordinary" filing to be had, but a log-based file system could exploit the logic well.