TF Card Specification

Read and write speed
Read and write speed is the core index to measure the performance of TF card, which affects the speed of file storage, transmission and reading. High-speed TF cartoon usually has a high read speed and write speed, especially suitable for storing high-definition video, game data and other application scenarios with high speed requirements.

• Read speed: Indicates the speed at which the TF card reads data from the card, usually in MB/s (megabytes per second).
• Write speed: Indicates the speed at which data is written to the card, also expressed in MB/s. Write speed is especially important for devices that store high-definition video or shoot at high speeds.

UHS (Ultra High Speed) Category:

• UHS-I: Up to 104MB/s.
• UHS-II: Up to 312MB/s.
• UHS-III: Up to 624MB/s (currently less used, more used for high-end applications).

Speed rating: SD cards are often marked with a speed rating that identifies the speed at which they can continuously write data.

• Class 10: Minimum write speed of 10MB/s, suitable for HD video recording.
• U1 (UHS Class 1) : The write speed is at least 10MB/s.
• U3 (UHS Class 3) : Write speed of at least 30MB/s, suitable for 4K video recording.
• V30/V60/V90: Video speed rating, V30 indicates write speed of at least 30MB/s, V60 and V90 are suitable for 4K/8K video recording at higher data rates, respectively.