Toshiba X300 Pro 18TB 3.5″ Hard Drive $493.05 Delivered @ Amazon US via AU
18 TB desktop/workstation hard disk drive Toshiba X300 Pro is the only large size PC/Workstation drive since 12 TB Seagate Barracuda Pro. While NAS and server drives work in PCs, this one is quieter than most and has lower power consumption (although still makes click sounds). This is the lowest price according to CCC and sold on Toshiba’s store, so you can be assured it’s not a second hand drive with reset S.M.A.R.T data. A downside is that Toshiba doesn’t sell consumer internal HDDs in Australia, so you will need to deal with Amazon for warranty claims. Comes with a 5 year warranty.