CREATE_VIRTUAL_DISK_PARAMETERS structure (virtdisk.h)
Contains virtual hard disk (VHD) creation parameters, providing control over, and information about, the newly created virtual disk.
Syntax
typedef struct _CREATE_VIRTUAL_DISK_PARAMETERS {
CREATE_VIRTUAL_DISK_VERSION Version;
union {
struct {
GUID UniqueId;
ULONGLONG MaximumSize;
ULONG BlockSizeInBytes;
ULONG SectorSizeInBytes;
PCWSTR ParentPath;
PCWSTR SourcePath;
} Version1;
struct {
GUID UniqueId;
ULONGLONG MaximumSize;
ULONG BlockSizeInBytes;
ULONG SectorSizeInBytes;
ULONG PhysicalSectorSizeInBytes;
PCWSTR ParentPath;
PCWSTR SourcePath;
OPEN_VIRTUAL_DISK_FLAG OpenFlags;
VIRTUAL_STORAGE_TYPE ParentVirtualStorageType;
VIRTUAL_STORAGE_TYPE SourceVirtualStorageType;
GUID ResiliencyGuid;
} Version2;
};
} CREATE_VIRTUAL_DISK_PARAMETERS, *PCREATE_VIRTUAL_DISK_PARAMETERS;
Members
Version
A value from the CREATE_VIRTUAL_DISK_VERSION enumeration that is the discriminant for the union.
| Value | Meaning |
|---|---|
|
Use the Version1 member of this structure. |
|
Use the Version2 member of this structure. |
Version1
This structure is used if the Version member is CREATE_VIRTUAL_DISK_VERSION_1 (1).
Version1.UniqueId
Unique identifier to assign to the virtual disk object. If this member is set to zero, a unique identifier is created by the system.
Version1.MaximumSize
The maximum virtual size, in bytes, of the virtual disk object. Must be a multiple of 512.
If a ParentPath is specified, this value must be zero.
If a SourcePath is specified, this value can be zero to specify the size of the source virtual disk to be used, otherwise the size specified must be greater than or equal to the size of the source disk.
Version1.BlockSizeInBytes
Internal size of the virtual disk object blocks, in bytes. This must be set to one of the following values.
Version1.SectorSizeInBytes
Internal size of the virtual disk object sectors. Must be set to 512.
| Value | Meaning |
|---|---|
|
The default and only allowable size, 512 bytes. |
Version1.ParentPath
Optional fully qualified path to a parent virtual disk object. Associates the new virtual disk with an existing virtual disk.
If this parameter is not NULL, SourcePath must be NULL.
Version1.SourcePath
Optional fully qualified path to pre-populate the new virtual disk object with block data from an existing disk. This path may refer to a virtual disk or a physical disk.
If this parameter is not NULL, ParentPath must be NULL.
Version2
This structure is used if the Version member is CREATE_VIRTUAL_DISK_VERSION_2 (2).
Windows 7 and Windows Server 2008 R2: This structure is not supported until Windows 8 and Windows Server 2012.
Version2.UniqueId
Unique identifier to assign to the virtual disk object. If this member is set to zero, a unique identifier is created by the system.
Version2.MaximumSize
The maximum virtual size, in bytes, of the virtual disk object. Must be a multiple of 512.
If a ParentPath is specified, this value must be zero.
If a SourcePath is specified, this value can be zero to specify the size of the source virtual disk to be used, otherwise the size specified must be greater than or equal to the size of the source disk.
Version2.BlockSizeInBytes
Internal size of the virtual disk object blocks, in bytes. For VHDX this must be a multiple of 1 MB between 1 and 256 MB. For VHD 1 this must be set to one of the following values.
Version2.SectorSizeInBytes
Internal size of the virtual disk object sectors. For VHDX must be set to 512 (0x200) or 4096 (0x1000). For VHD 1 must be set to 512.
Version2.PhysicalSectorSizeInBytes
Version2.ParentPath
Optional fully qualified path to a parent virtual disk object. Associates the new virtual disk with an existing virtual disk.
If this parameter is not NULL, SourcePath must be NULL.
Version2.SourcePath
Optional fully qualified path to pre-populate the new virtual disk object with block data from an existing disk. This path may refer to a virtual disk or a physical disk.
If this parameter is not NULL, ParentPath must be NULL.
Version2.OpenFlags
Zero or more flags from the OPEN_VIRTUAL_DISK_FLAG enumeration describing how the virtual disk is to be opened.
Version2.ParentVirtualStorageType
A VIRTUAL_STORAGE_TYPE structure describing the parent virtual disk specified in the ParentPath member.
Version2.SourceVirtualStorageType
A VIRTUAL_STORAGE_TYPE structure describing the source virtual disk specified in the SourcePath member.
Version2.ResiliencyGuid
Resiliency GUID for the file.
Note
The following parameters prefaced Version3 and Version4 are intended for internal use.
Version3
Version3.UniqueId
Version3.MaximumSize
Version3.BlockSizeInBytes
Version3.SectorSizeInBytes
Version3.PhysicalSectorSizeInBytes
Version3.ParentPath
Version3.SourcePath
Version3.OpenFlags
Version3.ParentVirtualStorageType
Version3.SourceVirtualStorageType
Version3.ResiliencyGuid
Version3.SourceLimitPath
Version3.BackingStorageType
Version4
Version4.UniqueId
Version4.MaximumSize
Version4.BlockSizeInBytes
Version4.SectorSizeInBytes
Version4.PhysicalSectorSizeInBytes
Version4.ParentPath
Version4.SourcePath
Version4.OpenFlags
Version4.ParentVirtualStorageType
Version4.SourceVirtualStorageType
Version4.ResiliencyGuid
Version4.SourceLimitPath
Version4.BackingStorageType
Version4.PmemAddressAbstractionType
Version4.DataAlignment
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 7 |
| Minimum supported server | Windows Server 2008 R2 |
| Header | virtdisk.h |