OPEN_VIRTUAL_DISK_FLAG enumeration (virtdisk.h)

Contains virtual hard disk (VHD) or CD or DVD image file (ISO) open request flags.

Syntax

typedef enum _OPEN_VIRTUAL_DISK_FLAG {
  OPEN_VIRTUAL_DISK_FLAG_NONE = 0x00000000,
  OPEN_VIRTUAL_DISK_FLAG_NO_PARENTS = 0x00000001,
  OPEN_VIRTUAL_DISK_FLAG_BLANK_FILE = 0x00000002,
  OPEN_VIRTUAL_DISK_FLAG_BOOT_DRIVE = 0x00000004,
  OPEN_VIRTUAL_DISK_FLAG_CACHED_IO = 0x00000008,
  OPEN_VIRTUAL_DISK_FLAG_CUSTOM_DIFF_CHAIN = 0x00000010,
  OPEN_VIRTUAL_DISK_FLAG_PARENT_CACHED_IO = 0x00000020,
  OPEN_VIRTUAL_DISK_FLAG_VHDSET_FILE_ONLY = 0x00000040,
  OPEN_VIRTUAL_DISK_FLAG_IGNORE_RELATIVE_PARENT_LOCATOR = 0x00000080,
  OPEN_VIRTUAL_DISK_FLAG_NO_WRITE_HARDENING = 0x00000100,
  OPEN_VIRTUAL_DISK_FLAG_SUPPORT_COMPRESSED_VOLUMES,
  OPEN_VIRTUAL_DISK_FLAG_SUPPORT_SPARSE_FILES_ANY_FS,
  OPEN_VIRTUAL_DISK_FLAG_SUPPORT_ENCRYPTED_FILES
} OPEN_VIRTUAL_DISK_FLAG;

Constants

OPEN_VIRTUAL_DISK_FLAG_NONE Value: 0x00000000 No flag specified.
OPEN_VIRTUAL_DISK_FLAG_NO_PARENTS Value: 0x00000001 Open the VHD file (backing store) without opening any differencing-chain parents. Used to correct broken parent links. This flag is not supported for ISO virtual disks.
OPEN_VIRTUAL_DISK_FLAG_BLANK_FILE Value: 0x00000002 Reserved. This flag is not supported for ISO virtual disks.
OPEN_VIRTUAL_DISK_FLAG_BOOT_DRIVE Value: 0x00000004 Reserved. This flag is not supported for ISO virtual disks.
OPEN_VIRTUAL_DISK_FLAG_CACHED_IO Value: 0x00000008 Indicates that the virtual disk should be opened in cached mode. By default the virtual disks are opened using FILE_FLAG_NO_BUFFERING and FILE_FLAG_WRITE_THROUGH. Windows 7 and Windows Server 2008 R2:  This value is not supported before Windows 8 and Windows Server 2012.
OPEN_VIRTUAL_DISK_FLAG_CUSTOM_DIFF_CHAIN Value: 0x00000010 Indicates the VHD file is to be opened without opening any differencing-chain parents and the parent chain is to be created manually using the AddVirtualDiskParent function. Windows 7 and Windows Server 2008 R2:  This value is not supported before Windows 8 and Windows Server 2012.
OPEN_VIRTUAL_DISK_FLAG_PARENT_CACHED_IO Value: 0x00000020
OPEN_VIRTUAL_DISK_FLAG_VHDSET_FILE_ONLY Value: 0x00000040
OPEN_VIRTUAL_DISK_FLAG_IGNORE_RELATIVE_PARENT_LOCATOR Value: 0x00000080
OPEN_VIRTUAL_DISK_FLAG_NO_WRITE_HARDENING Value: 0x00000100

Requirements

Requirement	Value
Minimum supported client	Windows 7
Minimum supported server	Windows Server 2008 R2
Header	virtdisk.h

See also

About VHD

VHD Reference