// wdm.h

typedef struct _BOOTDISK_INFORMATION {
  LONGLONG BootPartitionOffset;
  LONGLONG SystemPartitionOffset;
  ULONG    BootDeviceSignature;
  ULONG    SystemDeviceSignature;
} BOOTDISK_INFORMATION, *PBOOTDISK_INFORMATION;
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Windows Driver Kit DDI reference (ns-wdm-_bootdisk_information)

_BOOTDISK_INFORMATION structure

Description

The BOOTDISK_INFORMATION structure contains basic information describing the boot and system disks.

Members

`BootPartitionOffset`

Specifies the offset, in bytes, on the boot disk where the boot partition begins.

`SystemPartitionOffset`

Specifies the offset, in bytes, on the system disk where the system partition begins.

`BootDeviceSignature`

If the boot disk is formatted with an MBR partition table, this specifies the signature for the disk's MBR partition table. Otherwise, this member is unused.

`SystemDeviceSignature`

If the system disk is formatted with an MBR partition table, this specifies the signature for the disk's MBR partition table. Otherwise, this member is unused.

Remarks

IoGetBootDiskInformation returns this structure to describe the boot and system disks.

BOOTDISK_INFORMATION - NtDoc