On 2015-02-03 07:31, Takashi Iwai wrote:

>>> Then,
>>> udev unlocks the media and issues the SCSI eject ioctl unconditionally
>>> when DISK_EVENT_EJECT_REQUEST event is received.  Since SCSI ioctl
>>> doesn't take the open refcount into account, it results in the
>>> forcible eject.
>>
>> Which again is the expected behavior in the user's view.
>
> What if user doesn't want?  e.g. DVD/CD media is being burned?
>
FWIW, I have seen some drives where either the hardware or the drive 
firmware ignores the eject button while a write operation is in progress 
(ie, doesn't appear to even send the event, let alone eject the disk).