SD物理层规范版本4.20详细定义了数据通信中物理层的各项技术参数与实现要求，是确保设备间可靠连接的关键标准文档。
Memory Card is a specialized memory card designed to meet the security, capacity, performance, and environmental requirements of new audio and video consumer electronic devices. The SD Memory Card includes a content protection mechanism that complies with the SDMI standards security requirements and offers faster speeds along with higher storage capacity.
The SD Memory Card’s security system employs mutual authentication and a new cipher algorithm to prevent unauthorized usage of card content. Additionally, users have access to non-secure methods for accessing their own content.
SD memory cards may also support an additional security system based on commonly used standards such as ISO-7816, enabling the SD memory card to interface with public networks and other systems that support mobile e-commerce and digital signature applications.
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