PARTITION_INFORMATION

The PARTITION_INFORMATION structure contains partition information for a partition with a traditional AT-style Master Boot Record (MBR).

typedef struct _PARTITION_INFORMATION {
  LARGE_INTEGER  StartingOffset;
  LARGE_INTEGER  PartitionLength;
  DWORD  HiddenSectors;
  DWORD  PartitionNumber;
  BYTE  PartitionType;
  BOOLEAN  BootIndicator;
  BOOLEAN  RecognizedPartition;
  BOOLEAN  RewritePartition;
} PARTITION_INFORMATION, *PPARTITION_INFORMATION;

Members

StartingOffset

Specifies the offset in bytes on drive where the partition begins.

PartitionLength

Specifies the length in bytes of the partition.

HiddenSectors

Specifies the number of hidden sectors.

PartitionNumber

Specifies the number of the partition.

PartitionType

Indicates the system-defined MBR partition type. Possible values are as follows:

Partition Type	Meaning
PARTITION_ENTRY_UNUSED	Unused entry.
PARTITION_FAT_12	Specifies a partition with 12-bit FAT entries.
PARTITION_XENIX_1	Specifies a XENIX® Type 1 partition.
PARTITION_XENIX_2	Specifies a XENIX Type 2 partition.
PARTITION_FAT_16	Specifies a partition with 16-bit FAT entries.
PARTITION_EXTENDED	Specifies an MS-DOS® V4 extended partition.
PARTITION_HUGE	Specifies an MS-DOS V4 huge partition.
PARTITION_IFS	Specifies an IFS partition.
PARTITION_FAT32	Specifies a FAT32 partition.
PARTITION_FAT32_XINT13	Windows 95/98: Specifies a partition that uses extended INT 13 services.
PARTITION_XINT13_EXTENDED	Windows 95/98: Same as PARTITION_EXTENDED, but uses extended INT 13 services.
PARTITION_PREP	Specifies a PowerPC Reference Platform partition.
PARTITION_LDM	Specifies a logical disk manager partition.
PARTITION_UNIX	Specifies a UNIX partition.
PARTITION_NTFT	Specifies an NTFT partition. This value is used in combination (that is, bitwise logically ORed) with the other values in this table.

BootIndicator

Indicates, when TRUE, that this partition is a bootable (active) partition for this device. When FALSE, this partition is not bootable. This member is set according to the partition list entry boot indicator returned by IoReadPartitionTable.

RecognizedPartition

Indicates, when TRUE, that the system recognized the type of the partition. When FALSE, the system did not recognize the type of the partition.

RewritePartition

Indicates, when TRUE, that the partition information has changed. When FALSE, the partition information has not changed. This member has a value of TRUE when the partition has changed as a result of an IOCTL_DISK_SET_DRIVE_LAYOUT IOCTL. This informs the system that the partition information needs to be rewritten.

Headers

Declared in ntdddisk.h. Include ntdddisk.h.

Comments

The partition entry data in PARTITION_INFORMATION forms part of the drive layout information reported by the legacy routine IoReadPartitionTable in the DRIVE_LAYOUT_INFORMATION structure. DRIVE_LAYOUT_INFORMATION contains an array of PARTITION_INFORMATION structures pointed to by its PartitionEntry member. Each partition entry contains information for a partition on the drive. PARTITION_INFORMATION is also used with the legacy routine IoSetPartitionInformation to change the properties of the partition, such as its type, recorded on the disk.

In Windows® 2000 and later operating systems, disk drivers should use structures DRIVE_LAYOUT_INFORMATION_EX and PARTITION_INFORMATION_EX along with routines IoReadPartitionTableEx and IoSetPartitionInformationEx to read and alter partition information on the disk.

PARTITION_INFORMATION

Members

Headers

Comments

See Also