General
1.1 Scope
This part specifies the volume structure and file structure of the SD Memory Card (Secure Digital Memory
Card). The SD Memory Card file system that defines the logical structure uses FAT file system based on
ISO/IEC 9293 standard.
It also supports two areas: one for the Data Area that user can access without mutual authentication and
one for the Protected Area that user can access after mutual authentication.

Microsystems
SD Memory Card Specifications
PHYSICAL LAYER SPECIFICATION
Part 1
March 2000
SD Group
Matsushita Electric Industrial Co., Ltd. (MEI)
SanDisk Corporation
Toshiba Corporation