VOLUME_DISK_EXTENTS structure (winioctl.h)

Represents a physical location on a disk. It is the output buffer for the IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS control code.

typedef struct _VOLUME_DISK_EXTENTS {
  DWORD       NumberOfDiskExtents;
  DISK_EXTENT Extents[ANYSIZE_ARRAY];
} VOLUME_DISK_EXTENTS, *PVOLUME_DISK_EXTENTS;

NumberOfDiskExtents

The number of disks in the volume (a volume can span multiple disks).

An extent is a contiguous run of sectors on one disk. When the number of extents returned is greater than one (1), the error code ERROR_MORE_DATA is returned. You should call DeviceIoControl again, allocating enough buffer space based on the value of NumberOfDiskExtents after the first DeviceIoControl call.

Extents[ANYSIZE_ARRAY]

An array of DISK_EXTENT structures.

DISK_EXTENT

IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS