What is A1/A2 application performance class?

A standard formulated for comfortable operating of applications.

The Application Performance Class (App performance) is primarily a standard for micro SD cards. It is a measure of the performance grade required to comfortably launch and run applications on devices such as smartphones.

Application Performance Class 1 (A1)

Specified in the SD Physical Specification Ver. 5.1, allows users to not only store maps, photos, videos, music, dictionaries, documents, and other data on SD memory cards, but also to enjoy improvements in processing speed for editing and updating data. data, such as maps, photos, videos, music, dictionaries, and documents, on SD memory cards.

  • Minimum Random read speed : 1500 IOPS
  • Minimum Random write speed : 500 IOPS
  • Minimum Sequential speed : 10 MB/s

Application Performance Class 2 (A2)

Specified in the SD Physical Specification Ver. 6.0, enables efficient memory management when command queuing and caching or maintenance functions are supported

  • Minimum Random read speed : 4000 IOPS
  • Minimum Random write speed : 2000 IOPS
  • Minimum Sequential speed : 10 MB/s

For more information, please refer to the official website of the SD Association:
https://www.sdcard.org/developers/sd-standard-overview/application-performance-class/

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