What is the difference between speed class 3 and speed class 1 on SDXC cards?

Started Sep 3, 2014 | Discussions thread
Shop cameras & lenses ▾
ForumParentFirstPrevious
Flat view
Petroglyph
Petroglyph Senior Member • Posts: 4,970
What is the difference between speed class 3 and speed class 1 on SDXC cards?

The number appears inside a little U on the face of a UHS-I SDXC card. They also print the read speed e.g., 45 mb/s, does speed class have to do with write speed?

 Petroglyph's gear list:Petroglyph's gear list
Sony Alpha 7R II Pentax K-1 Pentax smc DA* 60-250mm F4.0 ED (IF) SDM Pentax smc DA* 300mm F4.0 ED (IF) SDM Pentax smc FA 43mm F1.9 Limited +5 more
ForumParentFirstPrevious
Flat view
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow