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  2. Most microSD cards available today are UHS-I, which have a theoretical maximum speed of 104 MB/s. There are also UHS-II cards, which have an extra row of pins on the back and can reach up to 312 MB/s. (A UHS-III standard exists as well but hasn’t seen wide adoption.) These are labeled on the card with a Roman numeral I or II.
    www.engadget.com/computing/accessories/best-…
    Look for a card rated U3. Cards rated U3 or V30 have a minimum sequential write speed of 30 MB/s, enough for 4K video. V60 and V90 microSD cards, which are fast enough to record 8K video, are expensive and require relatively rare UHS-II bus devices, so we didn’t test any.
    www.nytimes.com/wirecutter/reviews/best-micros…
    The next speed class up is the UHS (Ultra-High Speed) Speed Class and it’s denoted with the “U” symbol. There are two ratings within the UHS Speed Class: U1 (UHS Speed Class 1): minimum write speed of 10MB/s U3 (UHS Speed Class 3): minimum write speed of 30MB/s
    www.kingston.com/en/blog/personal-storage/mem…
     
  3. The best microSD cards of 2025: Expert tested - ZDNET

     
  4. SanDisk Micro SD Express, 256 GB Micro SD Card, Read …