Currently set as SCSI ID 0. I can install System 6.0.8 or 7.5 on it if you need it for a vintage Mac. The case also has two external power ports on it, useful for plugging in other peripherals. Note: My guess is that this likely had a smaller size drive in it originally, and it was upgraded to this larger drive. The item "Jasmine 4GB External SCSI Hard Drive for Vintage Macintosh" is in sale since Monday, February 15, 2021.This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Parts & Accessories". The seller is "jmorand" and is located in Leominster, Massachusetts. This item can be shipped worldwide.