[ GLOSSARY DEFINITION ] Storage

U3 speed

An SD card video speed class guaranteeing enough write speed for 4K recording.

Also known as: U3 rating

Full Definition & Technical Explanation

U3 speed guarantees a minimum sustained write rate suited to 4K video capture, one of the SD card speed-class markers.

See V90.

Where U3 speed Matters

Frequently Asked Questions

What is U3 speed?

An SD card video speed class guaranteeing enough write speed for 4K recording.

What terms are related to U3 speed?

Related Storage terms include A1 speed, A2 speed.

Related Technical Terms

A1 speed
An SD card performance class guaranteeing minimum random read and write for apps. Storage
A2 speed
A faster SD app-performance class than A1 for smoother app storage on cards. Storage
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