Sun CD-ROM drive won't mount after 2-3 ejects

[Malcolm Carlock]

We have a Sun IPC with attached CDROM drive which works up until after
the second or third eject operation, after which time attempts to mount
the CDROM filesystem (even from disks that had been successfully mounted
a few minutes before) fail with "I/O error".  The following methods
consistently work/don't work in clearing up the problem, which has been
present since the drive came out of the box:

Cycle power on CDROM drive			doesn't work

"shutdown -h" CPU, reboot, no power-off		works

Cycle power on CPU, reboot			works

Cycle power on entire setup			works

It looks like the kernel and/or some hardware in the CPU are getting
angry about something that only a kernel reboot can fix.  Has anyone
else run into this problem?  Does anyone know what sort of signal/ioctl
operation might clear things up without rebooting? 

Thanks in advance,

Malcolm L. Carlock                      Internet:  malc at unr.edu
                                        UUCP:      unr!malc
                                        BITNET:    malc at equinox