GetVolumeNameForVolumeMountPointW function (fileapi.h)

Retrieves a volume GUID path for the volume that is associated with the specified volume mount point ( drive letter, volume GUID path, or mounted folder).


BOOL GetVolumeNameForVolumeMountPointW(
  [in]  LPCWSTR lpszVolumeMountPoint,
  [out] LPWSTR  lpszVolumeName,
  [in]  DWORD   cchBufferLength


[in] lpszVolumeMountPoint

A pointer to a string that contains the path of a mounted folder (for example, "Y:\MountX\") or a drive letter (for example, "X:\"). The string must end with a trailing backslash ('\').

[out] lpszVolumeName

A pointer to a string that receives the volume GUID path. This path is of the form "\\?\Volume{GUID}\" where GUID is a GUID that identifies the volume. If there is more than one volume GUID path for the volume, only the first one in the mount manager's cache is returned.

[in] cchBufferLength

The length of the output buffer, in TCHARs. A reasonable size for the buffer to accommodate the largest possible volume GUID path is 50 characters.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


Use GetVolumeNameForVolumeMountPoint to obtain a volume GUID path for use with functions such as SetVolumeMountPoint and FindFirstVolumeMountPoint that require a volume GUID path as an input parameter. For more information about volume GUID paths, see Naming A Volume.

In Windows 8 and Windows Server 2012, this function is supported by the following technologies.

Technology Supported
Server Message Block (SMB) 3.0 protocol No
SMB 3.0 Transparent Failover (TFO) No
SMB 3.0 with Scale-out File Shares (SO) No
Cluster Shared Volume File System (CsvFS) Yes
Resilient File System (ReFS) No

SMB does not support volume management functions.

Mount points aren't supported by ReFS volumes.


Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header fileapi.h (include Windows.h)
Library Kernel32.lib
DLL Kernel32.dll

See also



Mounted Folders


Volume Management Functions