Windows error 4330 (ERROR_UNABLE_TO_EJECT_MOUNTED

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the medium is still mounted in a drive and cannot be ejected from the library.

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ERROR_CONTROLLING_IEPORT	ERROR_CLEANER_SLOT_SET

ERROR_UNABLE_TO_EJECT_MOUNTED_MEDIA

Dismount the cartridge before starting physical ejection

Ejection moves media through the insert/eject port, but mounted or opened media is still assigned to a drive and may be in use by an application. EjectNtmsMedia explicitly refuses media that is mounted or opened. This protects both application access and changer state; an eject request is not a substitute for releasing the drive resource.

Close application access, call DismountNtmsMedia and wait for the side to become idle and return to storage. Then queue the eject. If dismount does not finish, inspect the owning session and library request rather than forcing the port operation. For stand-alone devices, use the corresponding stand-alone eject API and understand its force semantics separately.

What to inspect

Close handles and identify the session using the medium.
Dismount the logical media and wait for idle state.
Start ejection only after the cartridge is out of the drive.

References

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