[JTatum]

OK,

More info. The SCSI controller on your motherboard should be an Ultra 2 LVD. Further research into the hard drives leads me to believe (if I'm reading the IBM model charts correctly) that you have the following installed in your machine.

#0 IBM Ultrastar 18ES
#1 IBM Ultrastar 18ES
#2 IBM Ultrastar 36LZX

Please confirm if this information is correct. Please note that if it is, you have two different drive types on the same bus. The 18ES is an Ultra2 LVD SCSI like your onboard controller and the 36LZX is an Ultra 160 LVD SCSI. I have conversed with a couple of friends on this topic and they also believe that this is what is causing your problem.

Providing my model information is correct, the recommendation is as follows:

Try removing the 36LZX from the SCSI chain to see if this corrects the problem. If it does, add an Ultra 160 SCSI card to your machine and run the new drive off of that. This will have the added benefit of increasing your throughput. BTW, the Adaptec 29160 works real well. Just be sure to disable the SCSI BIOS as you are not using it as a boot drive.