> > For Mass Storage Devices an alternative would be not to detach the
> > device at once, but hope that it will reappear shortly.  The serial number
> > of the device can be used to detect if the same device reappears.
>
>Two problems:
>
>	What happens if the device never comes back?
>
>	What about other SCSI disks (like ones plugged into PCMCIA cards)
>	which don't have this serial number facility?

Further, the serial number is almost never associated with the
actual media, but with the physical device.  This means that the
serial number you get back is usually worthless for removable
media devices.  You really need to tag the media if you want to make
this work.

--
Justin