System.Disk.Partitions.MBR

Types for dealing with the old-fasioned and modern Master Boot Records. This does not cover things like the GUID partition table or any of the weird variations like AAP or NEWLDR.

Documentation

data Timestamp

The so-called mystery bytes on Windows 95B, 98, 98SE, and Me -- in fact, they're a timestamp and a drive number. See http:thestarman.pcministry.comasmmbr/mystery.htm .

Constructors

Timestamp

Fields

physicalDrive :: Word8

seconds :: Word8

minutes :: Word8

hours :: Word8

Instances

Eq Timestamp

Show Timestamp

Binary Timestamp

data CHS

A representation of the cylinderheadsector address in MBRs.

Constructors

CHS

Fields

head :: Word8

The head number.

sector :: Word8

The sector number; this is actually a six-bit number, but Haskell doesn't have a convenient way to deal with those.

cylinder :: Word16

The cylinder number; likewise, this is actually a 10-bit number.

Instances

Eq CHS

Show CHS

Binary CHS

data PartitionEntry

Partition entries themselves are somewhat intricate.

Constructors

PartitionEntry

Fields

status :: Word8

A bitfield describing this partition. An 0x00 here means it's inactive; having bit 7 set (i.e. > 0x80) means bootable; anything less is invalid.

chsFirst :: CHS

The CHS address of the first absolute sector of the partition.

partitionType :: Word8

A partition type; for specifics, see the following document: http:www.win.tue.nl~aebpartitions/partition_types-1.html

chsLast :: CHS

The CHS address of the last absolute sector of the partition.

lbaFirst :: Word32

The logical block address of the first absolute sector.

sectors :: Word32

The number of sectors in the partition.

Instances

Eq PartitionEntry

Show PartitionEntry

Binary PartitionEntry

nullPartition :: PartitionEntry

The empty partition table entry.

bootable :: PartitionEntry -> Bool

Whether this partition entry is marked bootable.

data PartitionTable

An MBR partition table consists of (up to?) four partition entries.

Constructors

PartitionTable

Fields

first :: PartitionEntry

second :: PartitionEntry

third :: PartitionEntry

fourth :: PartitionEntry

Instances

Eq PartitionTable

Show PartitionTable

Binary PartitionTable

nullPartitionTable :: PartitionTable

The empty partition table.

data BootRecord

The structure of a Master Boot Record is as follows...

Constructors

BootRecord

Fields

bootloader :: ByteString

The first piece of data on a disk with a Master Boot Record is some bootloader code that gets loaded to address 0x7c00 in memory. N.B: this may include the data for the Windows timestamp, if it exists. It will also include the optional disk signature, if it exists -- thus this field is always 446 bytes long.

partitions :: PartitionTable

Four partition table entries.

bootSig :: Word16

Finally, the boot signature.

Instances

Eq BootRecord

Show BootRecord

Binary BootRecord

emptyBootloader :: ByteString

The empty bootloader -- 446 empty bytes.

nullBootRecord :: BootRecord

The empty boot record.

getTimestamp :: BootRecord -> Maybe Timestamp

Get the completely-optional, obsolete disk timestamp used by some old versions of Windows.

getDiskSignature :: BootRecord -> Maybe Word32

Get the optional disk signature from a Bootrecord's bootloader.