机器人-SD卡驱动资料-002-SD_File_System.doc

sd memory card specificationspart 2 file system specificationversion 1.0february 2000sd groupmatsushita electric industrial co., ltd. (mei)sandisk corporationtoshiba corporationconfidential standard microsystems standard microsystemssd memory card specifications / part 2. file system specification version 1.0conditions for publicationpublisher and copyright holdersd group(mei, sandisk, toshiba)confidentialitythis document shall be treated as confidential under the non disclosure agreement which hasbeen signed by the obtainer. reproduction in whole or in part is prohibited without prior writtenpermission of sd group.exemptionnone will be liable for any damages from use of this document.do not copy 2000 sd group (mei, sandisk, toshiba).fs-0confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0this page is intentionally left blank.do not copy 2000 sd group (mei, sandisk, toshiba).confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0 part2 file system specification1. general . fs-11.1 scope . 11.2 normative references . 21.3 definitions. 31.3.1 byte. 31.3.2 defective sector . 31.3.3 descriptor . 31.3.4 file. 31.3.5 sector / block. 31.3.6 partition. 31.3.7 user. 31.3.8 volume. 31.4 notations . 41.4.1 numerical notation . 41.4.2 arithmetic notation. 41.4.3 character strings. 41.4.4 list of acronyms . 41.5 data types . 51.5.1 numerical values in one-byte fields. 51.5.2 numerical values in two-byte fields. 51.5.3 numerical values in four-byte fields. 51.5.4 pairs of 12-bit integers . 52. volume structure. fs-72.1 arrangement of the data area. 82.1.1 physical address . 82.1.2 physical sector number . 82.1.3 logical sector number . 82.1.4 partition area and regular area . 82.2 arrangement of the user area . 92.2.1 clusters. 92.2.2 status of clusters . 92.3 arrangement of the partition area . 102.4 arrangement of the system area. 122.4.1 system area. 122.4.2 partition boot sector . 122.4.3 file allocation table (fat). 122.4.4 root directory. 12do not copy 2000 sd group (mei, sandisk, toshiba).fs-iconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.03. file structure .fs-133.1 partition boot sector . 133.2 file allocation table. 173.3 file directories. 183.3.1 characteristics . 183.3.2 directory entry types . 183.3.3 general definition of directory entry fields. 183.4 user area . 20do not copy 2000 sd group (mei, sandisk, toshiba).fs-iiconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0annexannex.fs-21annex a: file system layout. 21annex b: chs recommendation . 22annex c: sectors per cluster and boundary unit recommendation for data area . 23annex d: format parameter computations . 25do not copy 2000 sd group (mei, sandisk, toshiba).fs-iiiconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0list of figuresfigure 2-1 : example of volume structure for data area. fs-7figure a-1 : example of file system layout . 21do not copy 2000 sd group (mei, sandisk, toshiba).fs-ivconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0list of tablestable 2.3-1 : master boot record and partition table .fs-10table 2.3-2 : partition table . 10table 3.1-1 : fdc descriptor. 13table 3.1-2 : extended fdc descriptor. 13table 3.2-1 : fat entry value. 17table 3.3.3-1 : directory entry field. 18table b-1 : chs recommendation. 22table b-2 : example of partition table . 22table c-1 : sectors per cluster and boundary unit recommendation (data area) . 23table c-2 : maximum data area size and format parameters. 23table d-1 : extended fdc descriptor (regular area). 26do not copy 2000 sd group (mei, sandisk, toshiba).fs-vconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0this page is intentionally left blank.do not copy 2000 sd group (mei, sandisk, toshiba).fs-viconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.01. general1.1 scope1. general1.1 scopethis part specifies the volume structure and file structure of the sd memory card (secure digital memorycard). the sd memory card file system that defines the logical structure uses fat file system based oniso/iec 9293 standard.it also supports two areas: one for the data area that user can access without mutual authentication andone for the protected area that user can access after mutual authentication.do not copy 2000 sd group (mei, sandisk, toshiba).fs-1confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.01.2 normative references1)iso/iec646:1991information technology - iso 7-bit code character set for information interchange2)iso/iec9293:19941. general1.2 normative referencesinformation technology - volume and file structure of disk cartridges for information interchangedo not copy 2000 sd group (mei, sandisk, toshiba).fs-2confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.01.3 definitions1.3.1 bytea string of binary digits operated upon as a unit.1.3.2 defective sectora sector that cannot be read or written.1.3.3 descriptora recorded structure containing information about the volume or a file.1.3.4 filea named collection of information.1.3.5 sector / blocka unit of data that can be accessed independently of other units on the sd memory card.1.3.6 partitionan extent of sectors within a volume.1.3.7 user1. general1.3 definitionsa person or other entity that causes the invocation of the services provided by an implementation.1.3.8 volumea sector address space as specified in the relevant standard for recording.do not copy 2000 sd group (mei, sandisk, toshiba).fs-3confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.01.4 notations1.4.1 numerical notationnumbers in decimal notation are represented by decimal digits, namely 0 to 9.1. general1.4 notationsnumbers in hexadecimal notation are represented as a sequence of one or more hexadecimal digits namely 0to 9 and a to f, prefixed by “0x”.zero represents a single bit with the value 0.1.4.2 arithmetic notationthe notation ip(x) shall mean the integer part of x.the notation ceil(x) shall mean the minimum integer that is greater than x.1.4.3 character stringsa value for a sequence of bytes may be specified by a quoted sequence of characters, encoded according tothe iso/iec 646 standard.1.4.4 list of acronymsbp : byte position within a certain field, starting with 0 from the first byte of the field.fat : file allocation table.fdc : flexible disk cartridge.do not copy 2000 sd group (mei, sandisk, toshiba).fs-4confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.01.5 data types1.5.1 numerical values in one-byte fieldsa numerical value in a one-byte field shall be recorded as an 8-bit number in one-byte field.1.5.2 numerical values in two-byte fields1. general1.5 data typesa numerical value in a two-byte field shall be recorded in the little endian representation. it shall be recordedaccording to iso/iec 9293.1.5.3 numerical values in four-byte fieldsa numerical value in a four-byte field shall be recorded in the little endian representation. it shall be recordedaccording to iso/iec 9293.1.5.4 pairs of 12-bit integersa pair of 12-bit numbers shall be recorded in three-byte field according to iso/iec 9293.do not copy 2000 sd group (mei, sandisk, toshiba).fs-5confidential standard microsystemssd memory card specifications / part 2. file system specification version 1.0this page is intentionally left blank.do not copy 2000 sd group (mei, sandisk, toshiba).fs-61. generalconfidential standard microsystemssd memory card specifications / part 2. file system specification version 1.02. volume structure2. volume structurethe vol