SCSI Disk Controller

[Andrew Hume]

while sgi is tweaking its scsi disk controller, perhaps it could
allow the use of optical media at the same time. this media
can be used by exactly the same commands (common disk subset)
that the driver uses for the regular (magnetic) disk but no,
the driver cleverly looks up what thing it is and says, "nah nah!
i could but i won't."
	admittedly, the optical disks present one problem not normally
(but possibly) present in magnetic disks: the media may not be spun up
when you want to access (and thus needs a scsi START command).
this handles the media removal stuff as well as magnetic disks which don't spinup
on powerup.
	i guess what i am really asking for is simple 'raw disk' access to all
types of scsi media that can be controlled with the common disk subset
that is already used by the regular disk driver.