SHRINK_VOLUME_INFORMATION structure (winioctl.h)

Specifies the volume shrink operation to perform.

Syntax

typedef struct _SHRINK_VOLUME_INFORMATION {
  SHRINK_VOLUME_REQUEST_TYPES ShrinkRequestType;
  DWORDLONG                   Flags;
  LONGLONG                    NewNumberOfSectors;
} SHRINK_VOLUME_INFORMATION, *PSHRINK_VOLUME_INFORMATION;

Members

ShrinkRequestType

Indicates the operation to perform. The valid values are as follows.

Value	Meaning
ShrinkPrepare	Volume should perform any steps necessary to prepare for a shrink operation.
ShrinkCommit	Volume should commit the shrink operation changes.
ShrinkAbort	Volume should terminate the shrink operation.

Flags

This member must be zero.

NewNumberOfSectors

The number of sectors that should be in the shrunken volume. Used only when the ShrinkRequestType member is ShrinkPrepare, otherwise this member should be initialized to zero.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Header	winioctl.h (include Windows.h)

See also

FSCTL_SHRINK_VOLUME