Dan,

There are a few issues here to consider.

1) Make sure that the SCSI ID of the external drive does 
not conflict with any other device on the bus.  The 
internal HD is normally ID 0, and the Bus controller is 
always (on the SE/30) ID 7.

2) While terminating the external drive is important to 
proper operation of the bus, it is possible that the 
external drive is already terminated.  If the external 
drive was originally an internal drive, it would likely 
have termination enabled (either via a jumper or by 
resistor packs).  Excessive termination will cause the 
SCSI bus signal levels to be reduced to a point where 
the bus will likely not work.  You may also need to have 
the drive supply termination power to the bus.  This 
should not be needed though.

3) It is critical that any external devices be powered 
up and ready to accept SCSI commands before powering up 
the computer.  Drives can have a delayed startup 
(generally drive ID # X 5 or 10 seconds) and the drive 
must have completely initialized itself before it will 
respond to the bus.  In addition, drives on the Mac 
should not have the (wait for) attention jumper set.

4) I am not too sure about the OS-X minimum drive size.  
This has come up before, but I have never seen it.  My 
beige G-3 running 10.1.x has no problem "logging onto" 
my Q-950 with a 250 MB drive.  If I get a chance I will 
try with a smaller drive this weekend (I think my 
smallest drive is around 20 MB).  Are you certain that 
you have file sharing turned on?  Does the drive also 
have sharing enabled?  Both steps need to be completed 
before you will see the drive.

Derek

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