GET_VIRTUAL_DISK_INFO structure (virtdisk.h)
Contains virtual hard disk (VHD) information.
Syntax
typedef struct _GET_VIRTUAL_DISK_INFO {
GET_VIRTUAL_DISK_INFO_VERSION Version;
union {
struct {
ULONGLONG VirtualSize;
ULONGLONG PhysicalSize;
ULONG BlockSize;
ULONG SectorSize;
} Size;
GUID Identifier;
struct {
BOOL ParentResolved;
WCHAR ParentLocationBuffer[1];
} ParentLocation;
GUID ParentIdentifier;
ULONG ParentTimestamp;
VIRTUAL_STORAGE_TYPE VirtualStorageType;
ULONG ProviderSubtype;
BOOL Is4kAligned;
BOOL IsLoaded;
struct {
ULONG LogicalSectorSize;
ULONG PhysicalSectorSize;
BOOL IsRemote;
} PhysicalDisk;
ULONG VhdPhysicalSectorSize;
ULONGLONG SmallestSafeVirtualSize;
ULONG FragmentationPercentage;
GUID VirtualDiskId;
struct {
BOOL Enabled;
BOOL NewerChanges;
WCHAR MostRecentId[1];
} ChangeTrackingState;
};
} GET_VIRTUAL_DISK_INFO, *PGET_VIRTUAL_DISK_INFO;
Members
Version
A value of the GET_VIRTUAL_DISK_INFO_VERSION enumeration that specifies the version of the GET_VIRTUAL_DISK_INFO structure being passed to or from the virtual disk functions. This determines what parts of this structure will be used.
Size
A structure with the following members. Set the Version member to GET_VIRTUAL_DISK_INFO_SIZE.
Size.VirtualSize
Virtual size of the virtual disk, in bytes.
Size.PhysicalSize
Physical size of the virtual disk on physical disk, in bytes.
Size.BlockSize
Block size of the virtual disk, in bytes.
Size.SectorSize
Sector size of the virtual disk, in bytes.
Identifier
Unique identifier of the virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_IDENTIFIER.
ParentLocation
A structure with the following members. Set the Version member to GET_VIRTUAL_DISK_INFO_PARENT_LOCATION.
ParentLocation.ParentResolved
Parent resolution. TRUE if the parent backing store was successfully resolved, FALSE if not.
ParentLocation.ParentLocationBuffer[1]
If the ParentResolved member is TRUE, contains the path of the parent backing store.
If the ParentResolved member is FALSE, contains all of the parent paths present in the search list.
ParentIdentifier
Unique identifier of the parent disk backing store. Set the Version member to GET_VIRTUAL_DISK_INFO_PARENT_IDENTIFIER.
ParentTimestamp
Internal time stamp of the parent disk backing store. Set the Version member to GET_VIRTUAL_DISK_INFO_PARENT_TIMESTAMP.
VirtualStorageType
VIRTUAL_STORAGE_TYPE structure containing information about the type of virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_VIRTUAL_STORAGE_TYPE.
ProviderSubtype
Provider-specific subtype. Set the Version member to GET_VIRTUAL_DISK_INFO_PROVIDER_SUBTYPE.
| Value | Meaning |
|---|---|
|
Fixed. |
|
Dynamically expandable (sparse). |
|
Differencing. |
Is4kAligned
Indicates whether the virtual disk is 4 KB aligned. Set the Version member to GET_VIRTUAL_DISK_INFO_IS_4K_ALIGNED.
Windows 7 and Windows Server 2008 R2: This is not supported before Windows 8 and Windows Server 2012.
IsLoaded
Indicates whether the virtual disk is currently mounted and in use. TRUE if the virtual disk is currently mounted and in use; otherwise FALSE. Set the Version member to GET_VIRTUAL_DISK_INFO_IS_LOADED.
Windows 8 and Windows Server 2012: This is not supported before Windows 8.1 and Windows Server 2012 R2.
PhysicalDisk
Details about the physical disk on which the virtual disk resides. Set the Version member to GET_VIRTUAL_DISK_INFO_PHYSICAL_DISK.
Windows 7 and Windows Server 2008 R2: This is not supported before Windows 8 and Windows Server 2012.
PhysicalDisk.LogicalSectorSize
The logical sector size of the physical disk.
PhysicalDisk.PhysicalSectorSize
The physical sector size of the physical disk.
PhysicalDisk.IsRemote
Indicates whether the physical disk is remote.
VhdPhysicalSectorSize
The physical sector size of the virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_VHD_PHYSICAL_SECTOR_SIZE.
Windows 7 and Windows Server 2008 R2: This is not supported before Windows 8 and Windows Server 2012.
SmallestSafeVirtualSize
The smallest safe minimum size of the virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_SMALLEST_SAFE_VIRTUAL_SIZE.
Windows 7 and Windows Server 2008 R2: This is not supported before Windows 8 and Windows Server 2012.
FragmentationPercentage
The fragmentation level of the virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_FRAGMENTATION.
Windows 7 and Windows Server 2008 R2: This is not supported before Windows 8 and Windows Server 2012.
VirtualDiskId
The identifier that is uniquely created when a user first creates the virtual disk to attempt to uniquely identify that virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_VIRTUAL_DISK_ID.
Windows 8 and Windows Server 2012: This is not supported before Windows 8.1 and Windows Server 2012 R2.
ChangeTrackingState
The state of resilient change tracking (RCT) for the virtual disk. Set the Version member to GET_VIRTUAL_DISK_INFO_CHANGE_TRACKING_STATE.
Windows 8.1 and Windows Server 2012 R2: This member is not supported before Windows 10 and Windows Server 2016.
ChangeTrackingState.Enabled
Whether RCT is turned on. TRUE if RCT is turned on; otherwise FALSE.
ChangeTrackingState.NewerChanges
Whether the virtual disk has changed since the change identified by the MostRecentId member occurred. TRUE if the virtual disk has changed since the change identified by the MostRecentId member occurred; otherwise FALSE.
ChangeTrackingState.MostRecentId[1]
The change tracking identifier for the change that identifies the state of the virtual disk that you want to use as the basis of comparison to determine whether the NewerChanges member reports new changes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 7 |
| Minimum supported server | Windows Server 2008 R2 |
| Header | virtdisk.h |