DismountNtmsDrive function (ntmsapi.h)

Article
02/22/2024

[Removable Storage Manager is no longer available as of Windows 7 and Windows Server 2008 R2.]

The DismountNtmsDrive function queues a command to move the media in the specified drive to its storage slot. This function should be paired with the MountNtmsMedia function.

Syntax

DWORD DismountNtmsDrive(
  [in] HANDLE      hSession,
  [in] LPNTMS_GUID lpDriveId
);

Parameters

[in] hSession

Handle to the session returned by the OpenNtmsSession function.

[in] lpDriveId

Unique identifier of a drive object.

Return value

This function returns one of the following values.

Value	Meaning
ERROR_ACCESS_DENIED	NTMS_MODIFY_ACCESS to the library is denied. Other security errors are also possible, but they would indicate a security subsystem error. Windows XP: NTMS_CONTROL_ACCESS to the library is denied. Other security errors are also possible, but they would indicate a security subsystem error.
ERROR_DATABASE_FAILURE	The database is inaccessible or damaged.
ERROR_DATABASE_FULL	The database is full.
ERROR_DEVICE_NOT_AVAILABLE	The drive or library is not enabled.
ERROR_INVALID_DRIVE	The drive ID is not valid.
ERROR_INVALID_HANDLE	The session handle is missing or is not valid.
ERROR_INVALID_LIBRARY	The library for the drive is not valid.
ERROR_INVALID_PARAMETER	The drive ID is missing.
ERROR_INVALID_STATE	The drive does not contain media.
ERROR_NOT_ENOUGH_MEMORY	An allocation failure occurred during processing.
ERROR_SUCCESS	The function was successful.

Remarks

If the drive specified by the DismountNtmsDrive function is empty or if the media is opened, an error is returned. Otherwise, the media is returned to its slot.

Dismount requests to stand alone drives place the drive in the dismountable state and return success.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	ntmsapi.h
Library	Ntmsapi.lib
DLL	Ntmsapi.dll