The motherboard has wierd termination.

You need to check several things:

1. Are the scsi IDs of the drives different? If they are both apple drives, 
they are most likely set to ID 0. They can be anything but 7, which is the 
id of the scsi controller.

2. Check to make sure ONLY both ends of the scsi chain are terminated. If 
they are apple drives they were probably meant to be single drives, so they 
are probably both terminated. That is bad.

In my setup I even have to terminate the external port, with a cdrom 
attached to it and an active terminator. I don't trust the termination 
provided by the scsi controller one bit.

3. also make sure there is termination power provided by one of the drives. 
They will usually have a jumper that allows them to provide TERMPWR to the 
bus. One of them needs to have that jumper set. I don't think the scsi 
controller can provide TERMPWR for more than one internal drive.


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