SD card speed classes, bus interfaces, capacity types and application classes explained, including information on the forthcoming SD Express and SDUC. Video also includes speed tests of SanDisk Extreme PRO UHS-I and UHS-II SD cards. My follow-up video "Top SBC Micro SD Card" is now uploaded here: https://www.youtube.com/watch?v=YUResed38uo  My own preferred SD cards for video work are the SanDisk Extreme PRO models shown in the video, which can be found on Amazon.com here https://amzn.to/2SSaAL7 and Amazon.co.uk here: https://www.amazon.co.uk/dp/B07H9J1YXN/ref=nosim?tag=explainin-21 Please note that I have no affiliation with SanDisk, that this video is not sponsored, and that I personally purchased all cards and the reader featured in this video. Talking of the UHS-II reader, it can be found on Amazon.com here: https://amzn.to/2uGtgFD and Amazon.co.uk here: https://www.amazon.co.uk/dp/B01MQSR3SM/ref=nosim?tag=explainin-21 (affiliate links). More videos on computing and related topics can be found at: null You may also like my ExplainingTheFuture channel at: null #SDUC #SDExpress #SD #ExplainingComputers