硬盘BPB 格式

偏移Offset	大小	FAT16		偏移Offset	大小	FAT32	偏移Offset	大小	NTFS
0	3	JMP instruction		0	3	JMP instruction	0	3	JMP instruction
3	8	OEM		3	8	OEM	3	8	File system ID
BIOS 参数区块
0B	2	Bytes per sector		0B	2	Bytes per sector	0B	2	Bytes per sector
0D	1	Sectors per cluster		0D	1	Sectors per cluster	0D	1	Sectors per cluster
0E	2	Reserved sectors		0E	2	Reserved sectors	0E	2	Reserved sectors
10	1	Number of FATs		10	1	Number of FATs	10	3	(always zero)
11	2	Root entries(512)		11	2	Root entries (unused)
13	2	Sectors (under 32 MB)		13	2	Sectors (on small volumes)	13	2	(unused)
15	1	Media descriptor (hex)		15	1	Media descriptor (hex)	15	1	Media descriptor
16	2	Sectors per FAT		16	2	Sectors per FAT (small vol.)	16	2	(unused)
18	2	Sectors per track		18	2	Sectors per track	18	2	Sectors per track
1A	2	Heads		1A	2	Heads	1A	2	Heads
1C	4	Hidden sectors		1C	4	Hidden sectors	1C	4	Hidden sectors
20	4	Sectors (over 32 MB)		20	4	Sectors (on large volumes)	20	4	(unused)
FAT32扩展区块
24	1	BIOS drive (hex, HD=8x)		24	4	Sectors per FAT	24	4	(always 80 00 80 00)
25	1	(Unused)
26	1	Ext. boot signature (29h)
27	4	Volume serial number (hex)
				28	2	Extended flags	28	8	Total sectors
						/FAT mirroring disabled?
				2A	2	Version (usually 0)
2B	11	Volume label
				2C	4	Root dir 1st cluster
				30	2	FSInfo sector	30	8	Start C# $MFT
				32	2	Backup boot sector
				34	12	(Reserved)
36	8	File system
							38	8	Start C# $MFTMirr
3E	??	DBR
				40	1	BIOS drive (hex, HD=8x)	40	1	FILE record size indicator
				41	1	(Unused)	41	3	(unused)
				42	1	Ext. boot signature (29h)
				43	4	Volume serial number (hex)
							44	1	INDX buffer size indicator
							45	3	(unused)
				47	11	Volume label
							48	8	32-bit serial number (hex)
									/32-bit SN (hex, reversed)
									/64-bit serial number (hex)
							50	4	Checksum
				52	8	File system
							54	??	DBR
				5A	??	DBR
1FE	2	Signature (55 AA)		1FE	2	Signature (55 AA)	1FE	2	Signature (55 AA)