MSCP SCSI cdrom behavior

[9000 VAX]

Greeting,
  May I ask how an MSCP SCSI controller behaves when a CDROM drive is
connected to it? When there is no CD in the drive, what does "show
dev" console command show? Can I take out the CD when an OS is
running? Can I take out the CD after I unmount it from the file
system?

  My controller treats a CDROM drive as a read-only HD now. Please let
me know how other controllers deal with the CDROM drive. Thank you.

vax, 9000