// winioctl.h

typedef struct _SHRINK_VOLUME_INFORMATION {
  SHRINK_VOLUME_REQUEST_TYPES ShrinkRequestType;
  DWORDLONG                   Flags;
  LONGLONG                    NewNumberOfSectors;
} SHRINK_VOLUME_INFORMATION, *PSHRINK_VOLUME_INFORMATION;
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Win32 API reference (ns-winioctl-shrink_volume_information)

SHRINK_VOLUME_INFORMATION structure

Description

Specifies the volume shrink operation to perform.

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.

SHRINK_VOLUME_INFORMATION - NtDoc