I've got a Yamaha CRW6416S SCSI CDRW drive that upon cold boot will allow me 
to lock the drive tray using cdctl without having a disc in it.  But, once 
I unlock it, I cannot lock it again unless I put a CD in it.  cdctl does 
not report any errors but I do get the kernel message "Device not ready.  
Make sure there is a disc in the drive."

I would like to find out how to fix this because my chair is at the same 
height as the eject button and I hit it all the time.  And NO, leaving a 
CDROM in the drive is NOT an option.  I've search on google and looked on 
Yamaha's site but cannot find anything.

The CDRW firmware revision is 1.0d, which is the newest, so updating it 
won't help.  I'm wondering if a scsi bus reset will do the trick and would 
it affect my main drive which is also scsi?