Hi Abhi..
Well its just a myth, dont worry, all 1TB HDDs work gr8, I Myself hv a 1TB (eSATA+USB 2.0) ----> Seagate BlackArmor WS 110 HDD and it works gr8 Dude..
Well afaik, Seagate FreeAgent GoFlex HDD (1TB and Above) come with a USB 2.0 but also hv an option of a Docking Stand for a USB 3.0 connectivity option (TO be purchased separately wich costs hmm.. i guess 3-4K) NOT worth buying it jus for that Docking Station (Stand)....
So, if DONT mind the USB2.0 connectivity and want a really light and Portable option than opt for a WD MyBookEssential HDD or a Seagate F.A GoFlex 3.5" HDD
(if u are concerned abt the life and working) Then buy the one wich provied better and longer warranty support
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CHeers n e-peace....