Check out this Power Macintosh 5400/180 from 1997 with a whopping 6TB SCSI hard drive. I tried to turn this on to take a look, but it will not power up. It was not too surprising since it came in a plastic tub with standing water and leaves. I pulled the hard drive and erased it for the customer.
https://everymac.com/systems/apple/powermac/specs/powermac_5400_180.html
