Unable to reread SCSI optical disks

[Guest section DW]

On Tue, Jan 25, 2000 at 05:36:51PM +0100, Giuliano Pochini wrote:

> > I have an old MaxOptix optical drive that has been used for years
> > [...]
> > My problem comes when I unmount the disk, eject it and insert a
> > different disk. It appears to mount ok but when I look at the
> > data it has the directory structure that was on the old disk
> > [...]
> 
> Again this problem :-(  Some devices don't send the signal UNIT_ATTENTION when
> the disk is changed, so Linux don't know it has to flush the caches. I had the
> same problem with my M/O drive, then I discovered that a jumper can
> enable/disable that signal...
> You can solve the problem trying to mount the device while no disk is
> inserted. The failure will force a call to  invalidate_buffers() (see
> sd.c:check_media_change()). Then insert a new disk; it should work fine now.

Yes. A cleaner way is just to call "blockdev --flushbufs device".

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