What V30 V60 and V90 actually mean on SD cards

[BiscuitTin]

The speed class printed on an SD card matters more than the big read speed number when you are recording video. V30 means the card should sustain at least 30MB per second, V60 means at least 60MB per second, and V90 means at least 90MB per second. That is why a card such as the SanDisk 128GB Extreme PRO SDXC card can be fine for many 4K cameras, while the Kingston Canvas React Plus 128GB SDXC UHS-II Memory Card or Lexar Professional 1667x SD Card 128GB can be better picks for cameras that need V60. For high bitrate 8K or demanding professional modes, a V90 card such as the SanDisk 128GB Extreme PRO SDXC UHS-II V90 card is the safer direction. The short version is that video needs sustained write speed, not just a nice looking headline read speed

[Shannon91]

This is where a lot of people get caught out. A card can read fast but still be weak for recording video

[QuantumToken98]

V30 has been enough for my normal 4K use, but I would not risk it for paid work if the camera recommends V60

[RayOfLight]

I wish camera makers explained this better in menus instead of just showing a vague card error

[Megan34]

The difference between V60 and V90 only matters if the camera can push that much data. Otherwise it is wasted money

[TeaAndCode72]

This is where a lot of people get caught out. A card can read fast but still be weak for recording video.

Not sure I am fully with you on that one. Good thread this