Struct BPBExtension32 

pub struct BPBExtension32 {
    pub fat_size_32: [u8; 4],
    pub flags: [u8; 2],
    pub fs_version: [u8; 2],
    pub root_cluster: [u8; 4],
    pub fs_info: [u8; 2],
    pub bk_boot_sec: [u8; 2],
    pub reserved: [u8; 12],
}

Introduced with Windows 95, appears starting at byte 36 of the boot sector.

Fields

fat_size_32: [u8; 4]

32-bit version of fat_size

flags: [u8; 2]

bits 0-3 = active FAT, 4-6 reserved, 7 = disable mirroring, 8-15 reserved

fs_version: [u8; 2]

high byte = major, low byte = minor

root_cluster: [u8; 4]

cluster number of the root directory, usually 2

fs_info: [u8; 2]

sector number of FSINFO structure, usually 1. The boot sectors and backup boot sectors both point to the same FSInfo sector, even though a backup FSInfo exists in the backup sectors.

bk_boot_sec: [u8; 2]

if non-zero, indicates sector number of the backup boot record, usually 6. This is the start of the backup boot record, which may be multiple sectors.

reserved: [u8; 12]

reserved, set to 0

Trait Implementations

impl DiskStruct for BPBExtension32

fn new() -> Self

where Self: Sized,

create a structure with all zeros, requires concrete type

fn to_bytes(&self) -> Vec<u8>

flatten the structure into a byte stream

fn update_from_bytes(&mut self, dat: &[u8]) -> Result<(), DiskStructError>

update a structure from a byte stream, OK to use on trait objects

fn from_bytes(dat: &[u8]) -> Result<Self, DiskStructError>

where Self: Sized,

create a structure from a byte stream, requires concrete type

fn len(&self) -> usize

the length in bytes of the structure

fn from_bytes_adv( bytes: &[u8], ptr: &mut usize, ) -> Result<Self, DiskStructError>

where Self: Sized,

convenience function to call from_bytes and increment ptr by len()