No lock.  Tho I think it lies when sent an ALLOW_MEDIUM_REMOVAL command.
But, since this is USB anyway, it can be yanked from the bus at any time.

Matt

On Mon, Dec 31, 2001 at 01:08:29PM +0000, Alan Cox wrote:
> > Not quite.  The unit could be removed while mounted.  The SCSI layer
> > doesn't know that the media might have been changed.  So, while START_UNIT
> > is the SCSI layer's way of probing for media change, it's not the only way
> > that such a thing can be detected.
> 
> The media has no lock then ?
> 
> I'd still implement the simple start_unit change. That will fix the 99% of 
> events that actually matter.

-- 
Matthew Dharm                              Home: [EMAIL PROTECTED] 
Maintainer, Linux USB Mass Storage Driver

Would you mind not using our Web server? We're trying to have a game of 
Quake here.
                                        -- Greg
User Friendly, 5/11/1998

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