Here are the classes, structs, unions and interfaces with brief descriptions:

CbiosParmBlock	BIOS parameter block
Ccache_t	Cache for an SD data block
CCID
Ccsd_t
CCSDV1
CCSDV2
CdirectoryEntry	FAT short directory entry
CEngduinoAccelerometerClass
CEngduinoButtonClass
CEngduinoIRClass
CEngduinoLEDsClass
CEngduinoLightClass
CEngduinoMagnetometerClass
CEngduinoPackage
CEngduinoProtocolClass
CEngduinoSDClass
CEngduinoThermistorClass
Cfat32BootSector	Boot sector for a FAT16 or FAT32 volume
CFile
CmasterBootRecord	Master Boot Record
CpartitionTable	MBR partition table entry
CSd2Card	Raw access to SD and SDHC flash memory cards
CSDClass
CSdFile	Access FAT16 and FAT32 files on SD and SDHC cards
CSdVolume	Access FAT16 and FAT32 volumes on SD and SDHC cards
CSPIClass
CSPISettings