News Seagate responds to fraudulent hard drives scandal, says resellers should only buy from certified partners

I can tell you how - Amazon.

There are a lot of 'sellers' providing drives as recertified or officially refurbished that are not. They originate from China and cannot be covered by Seagate due to where the drive warranty code (on the drive itself) originates. Seagate has a warranty check app that allows you to enter the code and see the data associated with drives.

Unfortunately, with sites like Amazon and Newegg also being 'reseller' sites, and Seagate taking the approach that drives are not purchased from approved retailers is just a way to weasel out of responsibility if there is not a guarantee that the 'retailer' you buy from is actually the one you think you are buying from. The grey area provides enough reasonable doubt to opt out of supporting your purchase.