The DISK_INFO structure provides information about a disk.

 struct diskinfo {
   LdmObjectId id;
   LONGLONG length;
   LONGLONG freeBytes;
   unsigned long bytesPerTrack;
   unsigned long bytesPerCylinder;
   unsigned long bytesPerSector;
   unsigned long regionCount;
   unsigned long dflags;
   unsigned long deviceType;
   unsigned long deviceState;
   unsigned long busType;
   unsigned long attributes;
   boolean isUpgradeable;
   int portNumber;
   int targetNumber;
   int lunNumber;
   LONGLONG lastKnownState;
   LdmObjectId taskId;
   int cchName;
   int cchVendor;
   int cchDgid;
   int cchAdapterName;
   int cchDgName;
   [size_is(cchName)] wchar_t* name;
   [size_is(cchVendor)] wchar_t* vendor;
   [size_is(cchDgid)] byte* dgid;
   [size_is(cchAdapterName)] wchar_t* adapterName;
   [size_is(cchDgName)] wchar_t* dgName;
 };
 typedef struct diskinfo DISK_INFO;

id: Specifies the OID of the disk.

length: Size of the disk, in bytes.

freeBytes: Number of unallocated bytes on the disk.

bytesPerTrack: Size of a disk track, in bytes.

bytesPerCylinder: Size of a disk cylinder, in bytes.

bytesPerSector: Size of a disk sector, in bytes.

regionCount: Total number of regions on the disk.

dflags: Disk type of the disk.

Value	Meaning
DISK_AUDIO_CD 0x00000001	Disk is an audio CD.
DISK_NEC98 0x00000002	This value is obsolete and MUST NOT be used.

deviceType: Device type of the disk. This field contains one of the following values.

Value	Meaning
DEVICETYPE_UNKNOWN 0x00000000	Device is of an unknown type.
DEVICETYPE_VM 0x00000001	Device is a dynamic disk.
DEVICETYPE_REMOVABLE 0x00000002	Device uses removable media.
DEVICETYPE_CDROM 0x00000003	Device is a CD-ROM.
DEVICETYPE_FDISK 0x00000004	Device is a basic disk.
DEVICETYPE_DVD 0x00000005	Device is a DVD.

deviceState: Device state of the disk. The value of this field is generated by combining zero or more of the applicable flags with a logical OR operation. Valid combinations are device-type dependent.

Value	Meaning
DEVICESTATE_UNKNOWN 0x00000000	Disk is in an unknown state.
DEVICESTATE_HEALTHY 0x00000001	Disk is fully functional.
DEVICESTATE_NO_MEDIA 0x00000002	Disk has no media.
DEVICESTATE_NOSIG 0x00000004	Disk has an invalid signature.
DEVICESTATE_BAD 0x00000008	Disk was deleted or experienced an install or hardware problem.
DEVICESTATE_NOT_READY 0x00000010	Disk is not ready yet.
DEVICESTATE_MISSING 0x00000020	Disk is no longer available.
DEVICESTATE_OFFLINE 0x00000040	Disk is offline.
DEVICESTATE_FAILING 0x00000080	Disk experienced a physical I/O error.
DEVICESTATE_IMPORT_FAILED 0x00000100	Disk belongs to a group whose import failed.
DEVICESTATE_UNCLAIMED 0x00000200	Disk belongs to a foreign disk group.

busType: Type of bus on which the disk resides. This field contains one of the following values.

Value	Meaning
BUSTYPE_UNKNOWN 0x00000000	Bus type is unknown.
BUSTYPE_IDE 0x00000001	Disk resides on an Integrated Drive Electronics (IDE) bus.
BUSTYPE_SCSI 0x00000002	Disk resides on a SCSI bus.
BUSTYPE_FIBRE 0x00000003	Disk resides on a fiber channel bus.
BUSTYPE_USB 0x00000004	Disk resides on a universal serial bus (USB).
BUSTYPE_SSA 0x00000005	Disk resides on a serial storage architecture (SSA) Bus.
BUSTYPE_1394 0x00000006	Disk resides on an Institute of Electronics and Electrical Engineers (IEEE) 1394 bus.

attributes: Bitmap of disk attributes. The value of this field is generated by combining zero or more of the applicable flags defined in the following table with a logical OR operation.

Value	Meaning
DEVICEATTR_NONE 0x00000000	Disk has no attributes.
DEVICEATTR_RDONLY 0x00000001	Disk is read-only.
DEVICEATTR_NTMS 0x00000002	This value is obsolete.

isUpgradeable: Boolean value that indicates whether the disk can be converted to a dynamic disk. Will be true if the disk is basic, healthy, and has 512 byte sectors.

Value	Meaning
FALSE 0	Disk cannot be converted to a dynamic disk.
TRUE 1	Disk can be encapsulated or converted to a dynamic disk.

portNumber: SCSI port number of the disk, if the bus reports this information.

targetNumber: SCSI target identifier of the disk, if the bus reports this information.

lunNumber: SCSI logical unit number (LUN) of the disk, if the bus reports this information.

lastKnownState: Modification sequence number of the disk.

taskId: The task identifier of the associated user request. If no request is made, the value is 0. For more information about this task identifier, see section 2.2.17.

cchName: Length of the hard disk physical name, in Unicode characters, including the terminating null character.

cchVendor: Length of the disk's vendor name, in Unicode characters, including the terminating null character.

cchDgid: Length of the disk's group identification handle, in ASCII characters, including the terminating null character.

cchAdapterName: Length of the disk's adapter name, in Unicode characters, including the terminating null character.

cchDgName: Length of the disk's group name, in Unicode characters, including the terminating null character.

name: Null-terminated physical device name of the hard disk, in the format '\device\Harddisk1'. This is Unicode.

vendor: Null-terminated name of the hard disk vendor. This is the disk vendor's disk model name. This is Unicode.

dgid: Specifies the object identifier of the disk's disk group. This is ASCII.

adapterName: Null-terminated name of the disk adapter as returned by the disk adapter firmware; for example, 'Adaptec AHA-2940U2W - Ultra2 SCSI'. This is Unicode.

dgName: Null-terminated name for the disk's disk group, if the disk is dynamic. Only dynamic disks have an associated disk group. Basic disks do not. This is Unicode.