^^are you sure?as far as i know only thing that matters is the serial no.i know for a fact that if you buy seagate from any 3rd party in nehru place,delhi(i.e.except fortune marketing,the main seagate distributor there) & after a month or so enter serial online on seagate website to know remaining warranty status it will not show warranty from the date of your purchase but always from an earlier date(the date on which fortune marketing supplied hdd to the shop from where it was purchased) & importer as fortune marketing.it does not matter even if you have never registered your hdd serial because as soon as a hdd is sold/shipped from fortune marketing its serial no. is entered into the seagate database as sold & warranty starts from that date itself.no further proof is necessary to claim warranty.