I'm looking to possibly upgrade the SCSI drive in my Power Mac 8500. What type of SCSI drive should I be looking for? I'm a little bewildered by wide SCSI, ultra SCSI, sooper-dooper SCSI, etc.

Are all these newer SCSI standards backward compatible with the older SCSI controller in the 8500? Is the internal cable connector the same 50-pin square connector?