EWF_VOLUME_CONFIG

This read-only structure contains configuration information about an Enhanced Write Filter (EWF)-protected volume.

  typedef struct _EWF_VOLUME_CONFIG
{
    EWF_TYPE 
  Type
  ;
    EWF_STATE 
  State
  ;
    EWF_COMMAND 
  BootCommand
  ;
    UCHAR 
  PersistentData
  [EWF_MAX_PERSISTENT_DATA];
    USHORT 
  MaxLevels
  ;
    ULONG 
  ClumpSize
  ;
    USHORT 
  CurrentLevel
  ;
    union
    {
      struct
      {
        LONGLONG 
  DiskMapSize
  ;
        LONGLONG 
  DiskDataSize
  ;
      } DiskOverlay;
      struct
      {
        LONGLONG 
  RamDataSize
  ;
      } RamOverlay;
    };
    ULONG 
  MemMapSize
  ;
    EWF_VOLUME_DESC 
  VolumeDesc
  ;
    EWF_LEVEL_DESC 
  LevelDescArray
  [1];
  } EWF_VOLUME_CONFIG, * PEWF_VOLUME_CONFIG;

Members

  • Type
    Specifies the type of overlay for this volume: RAM, registry-described RAM, or disk.
  • State
    Specifies the state of the overlay for this volume. The state can be either enabled or disabled.
  • BootCommand
    Specifies a command to be executed on restart.
  • PersistentData
    Data that survives disable, enable, and restore operations. Persistent data size is EWF_MAX_PERSISTENT_DATA (32 bytes by default).
  • MaxLevels
    Maximum number of checkpoint levels in the overlay.
  • ClumpSize
    Size of the clumps, in bytes. ClumpSize must be 512 bytes.
  • CurrentLevel
    Current checkpoint level.
  • DiskMapSize
    Size of the mapping data that is contained on disk for the protected volume, in bytes (only for disk overlays).
  • DiskDataSize
    Size of the data to be stored on disk for the protected volume, in bytes (only for disk overlays).
  • RamDataSize
    Size of the data to be stored in RAM for the protected volume, in bytes (only for RAM overlays).
  • MemMapSize
    Size of the mapping data that is contained in memory for the protected volume, in bytes.
  • VolumeDesc
    Volume device name and volume ID.
  • LevelDescArray
    Level description and end time, and level data size. Number of entries is specified by MaxLevels.

Requirements

OS Versions: Windows XP Embedded.
Header: Ewfapi.h.
Link Library: Ewfapi.dll, Ewfapi.lib.

See Also

EwfMgrGetProtectedVolumeConfig | EWF API Functions | EWF API Code Sample

Last updated on Wednesday, October 18, 2006

© 2006 Microsoft Corporation. All rights reserved.

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