root_directory_cluster : 32 : littleendian;
_ : 16; (* FS information sector *)
_ : 16; (* Backup of boot sector *)
- pad : 12*8 : bitstring; (* Reserved *)
+ _ : 12*8 : bitstring; (* Reserved *)
_ : 8; (* Physical drive number *)
_ : 8; (* Reserved *)
_ : 8; (* Extended boot signature *)
serial : 32 : littleendian; (* Serial number. *)
volume_label : 88 : string; (* Volume label. *)
"FAT32 " : 64 : string; (* FAT32 identifier. *)
- code : 420*8 : bitstring; (* Boot code. *)
+ _ : 420*8 : bitstring; (* Boot code. *)
0x55AA : 16 } -> (* End of bootsector magic. *)
let blocksize = bytes_per_sector * sectors_per_cluster in