- 128G Storage Capacity
- Class 10 / UHS-I U3
- Max. Read Speed: 99MB/s
- Max Write Speed: 50MB/s
- Write-Protect Switch on SD Adapter
- Supports Advanced Video Modes
- HD/3D/4K Video & High Frame Rate Ready
- SD Adapter Included
UHS Speed Class
The next rating is the UHS Speed Class. This stands for Ultra High Speed and refers to minimum sustained writing performance for recording video. UHS came about due to 4K-capable video devices needing faster write speeds.
The SD Association has two UHS Speed Classes, UHS Speed Class 1 and UHS Speed Class 3. UHS Speed Class 1 supports a minimum 10MB/s write speed, whereas UHS Speed Class 3 supports at least 30MB/s write speed. The UHS Speed Class is denoted by either a 1 or 3 inside of a bucket U symbol. As a rule of thumb, 4K-capable camcorders will usually require at least a U3 rated SD card.