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FILE SYSTEM SPECIFICATION Part 2 Version 1.0 SD Memory Card Specifications Microsystems Standard SanDisk Corporation Toshiba Corporation February 2000 SD Group Matsushita Electric Industrial Co., Ltd. (MEI) CONFIDENTIAL

Microsystems Standard

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 Conditions for publication Publisher and Copyright Holder SD Group(MEI, SanDisk, Toshiba) Confidentiality This document shall be treated as confidential under the Non Disclosure Agreement which has been signed by the obtainer. Reproduction in whole or in part is prohibited without prior written permission of SD Group. Exemption None will be liable for any damages from use of this document. Microsystems Standard DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). FS-0 CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 This page is intentionally left blank. Microsystems Standard DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 Part2 FILE SYSTEM SPECIFICATION 1. General.............................................................................................................................................................. FS-1 1.1 Scope ..................................................................................................................................................................... 1 1.2 Normative References ........................................................................................................................................ 2 1.3 Definitions............................................................................................................................................................ 3 1.3.1 byte............................................................................................................................................................. 3 1.3.2 defective sector ........................................................................................................................................ 3 1.3.3 descriptor.................................................................................................................................................. 3 1.3.4 file............................................................................................................................................................... 3 1.3.5 sector / block........................................................................................................................................... 3 1.3.6 partition..................................................................................................................................................... 3 1.3.7 user............................................................................................................................................................. 3 1.3.8 volume....................................................................................................................................................... 3 1.4 Notations .............................................................................................................................................................. 4 1.4.1 Numerical notation ................................................................................................................................. 4 1.4.2 Arithmetic notation................................................................................................................................. 4 1.4.3 Character strings...................................................................................................................................... 4 1.4.4 List of acronyms ..................................................................................................................................... 4 1.5 Data types ............................................................................................................................................................. 5 1.5.1 Numerical values in one-byte fields...................................................................................................... 5 1.5.2 Numerical values in two-byte fields...................................................................................................... 5 1.5.3 Numerical values in four-byte fields..................................................................................................... 5 1.5.4 Pairs of 12-bit integers ........................................................................................................................... 5 Microsystems Standard 2. Volume Structure............................................................................................................................................. FS-7 2.1 Arrangement of the Data Area......................................................................................................................... 8 2.1.1 Physical Address...................................................................................................................................... 8 2.1.2 Physical Sector Number......................................................................................................................... 8 2.1.3 Logical Sector Number .......................................................................................................................... 8 2.1.4 Partition Area and Regular Area ........................................................................................................... 8 2.2 Arrangement of the User Area......................................................................................................................... 9 2.2.1 Clusters...................................................................................................................................................... 9 2.2.2 Status of clusters ..................................................................................................................................... 9 2.3 Arrangement of the Partition Area................................................................................................................ 10 2.4 Arrangement of the System Area................................................................................................................... 12 2.4.1 System Area............................................................................................................................................ 12 2.4.2 Partition Boot Sector ............................................................................................................................ 12 2.4.3 File Allocation Table (FAT)................................................................................................................. 12 2.4.4 Root Directory....................................................................................................................................... 12 CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). FS-i

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 3. File Structure..................................................................................................................................................FS-13 3.1 Partition Boot Sector ........................................................................................................................................ 13 3.2 File Allocation Table......................................................................................................................................... 17 3.3 File directories.................................................................................................................................................... 18 3.3.1 Characteristics........................................................................................................................................ 18 3.3.2 Directory entry types ............................................................................................................................ 18 3.3.3 General definition of Directory entry fields..................................................................................... 18 3.4 User Area............................................................................................................................................................ 20 Microsystems Standard DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL FS-ii

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 Annex Annex Annex Annex Annex...................................................................................................................................................................FS-21 Annex A: File System Layout................................................................................................................................. 21 Annex B: CHS Recommendation ......................................................................................................................... 22 Annex C: Sectors per Cluster and Boundary Unit Recommendation for Data Area ................................... 23 Annex D: Format Parameter Computations ....................................................................................................... 25 Microsystems Standard DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL FS-iii

SD Memory Card Specifications / Part 2. File System Specification Version 1.0 List of Figures List of Figures List of Figures List of Figures Figure 2-1 : Example of Volume Structure for Data Area............................................................................ FS-7 Figure A-1 : Example of File System Layout ...................................................................................................... 21 Microsystems Standard FS-iv DO NOT COPY 2000 SD Group (MEI, SanDisk, Toshiba). CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL CONFIDENTIAL

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