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DRIVE_LAYOUT_INFORMATION_EX structure (winioctl.h)

  • Article

Contains extended information about a drive's partitions.

Syntax

typedef struct _DRIVE_LAYOUT_INFORMATION_EX {
  DWORD                    PartitionStyle;
  DWORD                    PartitionCount;
  union {
    DRIVE_LAYOUT_INFORMATION_MBR Mbr;
    DRIVE_LAYOUT_INFORMATION_GPT Gpt;
  } DUMMYUNIONNAME;
  PARTITION_INFORMATION_EX PartitionEntry[1];
} DRIVE_LAYOUT_INFORMATION_EX, *PDRIVE_LAYOUT_INFORMATION_EX;

Members

PartitionStyle

The style of the partitions on the drive enumerated by the PARTITION_STYLE enumeration.

Style Value Meaning
PARTITION_STYLE_MBR 0 Master boot record (MBR) format.
PARTITION_STYLE_GPT 1 GUID Partition Table (GPT) format.
PARTITION_STYLE_RAW 2 Partition not formatted in either of the recognized formats—MBR or GPT.

PartitionCount

The number of partitions on the drive. On hard disks with the MBR layout, this value will always be a multiple of 4. Any partitions that are actually unused will have a partition type of PARTITION_ENTRY_UNUSED (0) set in the PartitionType member of the PARTITION_INFORMATION_MBR structure of the Mbr member of the PARTITION_INFORMATION_EX structure of the PartitionEntry member of this structure.

DUMMYUNIONNAME

DUMMYUNIONNAME.Mbr

A DRIVE_LAYOUT_INFORMATION_MBR structure containing information about the master boot record type partitioning on the drive.

DUMMYUNIONNAME.Gpt

A DRIVE_LAYOUT_INFORMATION_GPT structure containing information about the GUID disk partition type partitioning on the drive.

PartitionEntry[1]

A variable-sized array of PARTITION_INFORMATION_EX structures, one structure for each partition on the drive.

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header winioctl.h (include Windows.h)

See also

DRIVE_LAYOUT_INFORMATION_GPT, DRIVE_LAYOUT_INFORMATION_MBR, IOCTL_DISK_GET_DRIVE_LAYOUT_EX, IOCTL_DISK_SET_DRIVE_LAYOUT_EX, PARTITION_INFORMATION_EX, PARTITION_INFORMATION