Same drive as this deal but even cheaper by more than 50 dollarydoos, however it is on backorder and is fulfilled by amazon UK rather than US https://www.ozbargain.com.au/node/557264
This model should have an Exos X16 ST16000NM001G 16TB (7200 RPM) inside and is less than $27/TB.
The seagate external drives come with AU plugs. So stop asking.
Does not need mod for 3.3v pin issue, that affects some WD drives not Seagate.
Highly recommended to do a write check to see if there are bad sectors before shucking. Use a program like HD Tune. Takes around two days.
You should be able to use Crystal Disk Info to determine the drive inside.
Tutorial on HD Tune
Was $422.43 at original time of posting.
The Amazon US deal also seems to have dropped to $459.23 ($28.70/TB).
Thanks to XZT for letting me know of the price change.