Two Hard Drives in a 7500

[Michael]

I have a 7500 to which I added a secondary 2 GB SCSI hard drive. I 
added the second hard drive to the bay directly below the main hard 
drive. I connected the power cable and the SCSI ribbon cable (on the 
second "SCSI port" on the ribbon) and then started the machine up. 
Trouble is, the second hard drive doesn't mount. When I use Disk First 
Aid, it doesn't find the second hard drive. Is there something I'm 
missing? My roommate, who is a PC person, suggested that the second 
hard drive needs a jumper setting to designate it as a slave to the 
existing master. That's all new to me. Is this accurate? I know the 
hard drive works. I scavenged it from an older Mac after having tested 
it.

Can anyone give me advice on this?

Thanks,
Michael
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