Speed Class

TF cards and other storage media typically indicate their minimum sustained write speeds using performance classes. This helps users select appropriate cards based on their application needs to ensure recording quality and device stability.

1. Traditional Speed Class

Class	Minimum Sustained Write Speed	Suitable Application
Class 2	2 MB/s	Lower standard definition, rarely used nowadays
Class 4	4 MB/s	Suitable for standard definition recording
Class 6	6 MB/s	Suitable for 720p HD video recording
Class 10	10 MB/s	Suitable for 1080p Full HD video recording

2. UHS Speed Class (Ultra High Speed)

UHS classes provide a more precise differentiation of high-speed cards, especially suitable for HD video and high frame rate recording.

Class	Minimum Sustained Write Speed	Description
U1	10 MB/s	Supports Full HD video recording
U3	30 MB/s	Supports 4K and higher bitrate video recording

3. Video Speed Class

Designed specifically for high bitrate video recording to guarantee sustained write speed and avoid frame drops.

Class	Minimum Sustained Write Speed	Typical Use
V10	10 MB/s	Suitable for HD (1080p) recording
V30	30 MB/s	4K video recording, professional cameras
V60	60 MB/s	8K and high bitrate video recording
V90	90 MB/s	Ultra HD professional recording