Network, Computer and Programming Resources
Boot Sector and BPB Structure[Fat32]-> BPB_RootClus [Offset=44, Size=4]Boot Sector and BPB Structure[Fat32]-> BS_BootSig [Offset=66, Size=1]Boot Sector and BPB Structure[Fat32]-> BS_DrvNum [Offset=64, Size=1]Boot Sector and BPB Structure[Fat32]-> BS_FilSysType [Offset=82, Size=8]Boot Sector and BPB Structure[Fat32]-> BS_Reserved1 [Offset=65, Size=1]Boot Sector and BPB Structure[Fat32]-> BS_VolID [Offset=67, Size=4]Boot Sector and BPB Structure[Fat32]-> BS_VolLab [Offset=71, Size=11]Boot Sector and BPB Structure-> BPB_BytsPerSec [Offset=11, Size=2]Boot Sector and BPB Structure-> BPB_FATSz16 [Offset=22, Size=2]Boot Sector and BPB Structure-> BPB_HiddSec [Offset=28, Size=4]Boot Sector and BPB Structure-> BPB_Media [Offset=21, Size=1]Boot Sector and BPB Structure-> BPB_NumFATs [Offset=16, Size=1]
Fat32 - Boot Sector and BPB Structure-> BPB_BytsPerSec [Offset=11, Size=2]
Count of bytes per sector. This value may take on only the following values: 512, 1024, 2048 or 4096. If maximum compatibility with old implementations is desired, only the value 512 should be used. There is a lot of FAT code in the world that is basically “hard wired” to 512 bytes per sector and doesn’t bother to check this field to make sure it is 512. Microsoft operating systems will properly support 1024, 2048, and 4096.Note: Do not misinterpret these statements about maximum compatibility. If the media being recorded has a physical sector size N, you must use N and this must still be less than or equal to 4096. Maximum compatibility is achieved by only using media with specific sector sizes.