Excessivly cheap USB device issue

Robert Noland rnoland at FreeBSD.org
Tue Sep 29 10:11:34 UTC 2009

On Tue, 2009-09-29 at 14:35 +0930, Daniel O'Connor wrote:
> On Mon, 28 Sep 2009, Mike Tancsa wrote:
> > >I also have a similar device, which I've been messing with a bit the
> > >last couple of days.  In your case, it isn't seeing the media, just
> > > the "drive".  I've had to try various combinations of unplugging
> > > the adapter from usb, inserting the media then plugging it back in.
> > >  It does seem to work fairly reliably if you boot with the media
> > > already inserted, but it doesn't seem to detect media change at
> > > all.
> >
> > I get around it (on my cheap reader) by  always doing a
> > cat /dev/null > /dev/da1
> > whever I change or insert new media into the reader
> >
> > That seems to work with the gear I have 99% of the time.
> Hmm OK, I sort of expected fdisk da1 to fail straightaway though (it 
> takes ~30 seconds to fail for me).
> I have unplugged it for now, it interacts annoyingly with SANE because 
> that scans the SCSI bus(es) looking for scanner and each umass takes 
> 30+ seconds to fail.

FWIW, on yesterdays kernel, mine seems to be working properly and
detecting media change.  I'm not sure what change helped.  Note that I
am running -CURRENT.


Robert Noland <rnoland at FreeBSD.org>

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