ExFAT: Difference between revisions

| 0x060 || 4 || FirstClusterOfRootDirectory || The starting cluster of the root directory's cluster chain.

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| 0x068 || 2 || FileSystemRevision || Specifies the version of exFAT specification to which the structures in this partition adhere. For now, there is only a single exFAT specification; version 1.00. However in the future there may be more than this, and a driver should not attempt to parse exFAT structures of an exFAT specification version with which it is not familiar.

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=== Extended Boot Sectors Structure ===

=== Filesystem Header ===

 

struct bootsector {

char jump[3];

char bootsign[2];

};

Block bitmap is cluster 2, upcase tbl is cluster 3.

 

 

=== Boot Checksum Calculation ===

UInt32 BootChecksum (UCHAR * Sectors, USHORT BytesPerSector)

{

return Checksum;

}

 

 

32-byte entries. Entries contain one of a few possible entry types, first byte identifies which type it is. The second byte identifies how many subsequent entries are part of this entry. All bytes after are dependent on the type of entry. Any entry with the highest bit of entrytype set is not used.

 

struct {

uint8_t entrytype = 0x85;

char pad[12];

} fileEntry;

 

struct {

uint8_t entryType = 0xC0;

uint64_t filesize2;

} fileInfoEntry;

 

struct {

uint8_t entrytype = 0xC1, entrycount = 0x00;

uint16_t name[15];

} filenameEntry;