Secure Digital cards provide high performance, thanks to the 1 and 4 bits configurable bus. Sustained read speed is up to 12MB/sec and sustained write speed is up to 9MB/sec.

The usage of Single Level Cell flash combined with the built-in Error Correction, Bad Block Management and Wear Leveling algorithms extends the endurance of the memory to 2,000,0000 Write/Erase cycles per block for 128MB, 256MB and 512MB. For 1GB and 2GB SD card the endurance is 300,000 Write/Erase cycles per block since these capacities use the latest flash components to provide better performance, cost optimization and long term support.

Secure Digital products support as an optional feature the card internal write protect as well as the card read lock/unlock feature in compliance with the latest SD specifications. In addition, any card supports the CPRM protocol to protect the copyrighted data recorded on the SD Memory Card from unauthorized use.