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OPEN_VIRTUAL_DISK_FLAG enumeration (virtdisk.h)

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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