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struct bootsector710 {
	BYTE	bsJump[3];					// jump inst E9xxxx or EBxx90
	CHAR	bsOEMName[8];				// OEM name and version
	CHAR	bsBPB[53];					// BIOS parameter block
	CHAR	bsExt[26];					// Bootsector Extension
	CHAR	bsBootCode[418];			// pad so structure is 512b
	BYTE	bsBootSectSig2;				// 2 & 3 are only defined for FAT32?
	BYTE	bsBootSectSig3;
	BYTE	bsBootSectSig0;				// boot sector signature byte 0x55
	BYTE	bsBootSectSig1;				// boot sector signature byte 0xAA
#define BOOTSIG0        0x55
#define BOOTSIG1        0xaa
#define BOOTSIG2        0
#define BOOTSIG3        0
};

// BPB for DOS 7.10 (FAT32)
// This one has a few extensions to bpb50.
struct bpb710 {
		WORD	bpbBytesPerSec;	// bytes per sector
		BYTE	bpbSecPerClust;	// sectors per cluster
		WORD	bpbResSectors;	// number of reserved sectors
		BYTE	bpbFATs;		// number of FATs
		WORD	bpbRootDirEnts;	// number of root directory entries
		WORD	bpbSectors;		// total number of sectors
		BYTE	bpbMedia;		// media descriptor
		WORD	bpbFATsecs;		// number of sectors per FAT
		WORD	bpbSecPerTrack;	// sectors per track
		WORD	bpbHeads;		// number of heads
		DWORD	bpbHiddenSecs;	// # of hidden sectors
// 3.3 compat ends here
		DWORD	bpbHugeSectors;	// # of sectors if bpbSectors == 0
// 5.0 compat ends here
		DWORD     bpbBigFATsecs;// like bpbFATsecs for FAT32
		WORD      bpbExtFlags;	// extended flags:
#define FATNUM    0xf			// mask for numbering active FAT
#define FATMIRROR 0x80			// FAT is mirrored (like it always was)
		WORD      bpbFSVers;	// filesystem version
#define FSVERS    0				// currently only 0 is understood
		DWORD     bpbRootClust;	// start cluster for root directory
		WORD      bpbFSInfo;	// filesystem info structure sector
		WORD      bpbBackup;	// backup boot sector
		// There is a 12 byte filler here, but we ignore it
};

이러한 구조체가 있구요. 선언은

struct bpb710 *bpb;

로 하고,

bpb = (struct bpb710 *) ((struct bootsector710 *) SectorBuffer)->bsBPB;

이런 코드가 있습니다. 예제코드에서 찾아낸 부분인데요, 이렇게 하면 어떻게 한방에 구조체에 format 이 일정한
dump 된 byte 집합들을 넣어버릴수 있는건가요?

계속 쓰고는 있지만, 이해하기가 조금 힘드네요.