// storduid.h

typedef struct _STORAGE_DEVICE_LAYOUT_SIGNATURE {
  ULONG   Version;
  ULONG   Size;
  BOOLEAN Mbr;
  union {
    ULONG MbrSignature;
    GUID  GptDiskId;
  } DeviceSpecific;
} STORAGE_DEVICE_LAYOUT_SIGNATURE, *PSTORAGE_DEVICE_LAYOUT_SIGNATURE;
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Windows Driver Kit DDI reference (ns-storduid-_storage_device_layout_signature)

_STORAGE_DEVICE_LAYOUT_SIGNATURE structure

Description

The STORAGE_DEVICE_LAYOUT_SIGNATURE structure defines a device layout structure.

Members

`Version`

The version of the DUID.

`Size`

The size, in bytes, of this STORAGE_DEVICE_LAYOUT_SIGNATURE structure.

`Mbr`

A Boolean value that indicates whether the partition table of the disk is formatted with a master boot record (MBR). If TRUE, the partition table of the disk is formatted with a master boot record (MBR). If FALSE, the disk has a GUID partition table (GPT).

`DeviceSpecific`

`DeviceSpecific.MbrSignature`

The signature value, which uniquely identifies the disk.

`DeviceSpecific.GptDiskId`

The GUID that uniquely identifies the disk.

Remarks

The device layout signature contributes to the definition of a device unique identifier (DUID). For more information about DUIDs, see the description of the STORAGE_DEVICE_UNIQUE_IDENTIFIER structure.

STORAGE_DEVICE_LAYOUT_SIGNATURE - NtDoc