Largest External USB HDD not needing its own power

[Daaaveee]

I'm looking to get a large external HDD for storage and backup, however I don't want to have to be plugging it in to a power socket like I have to with my old WD MyBook.

Anyone have any ideas?

 

[AbsenceJam]

It'll have to be one that uses a 2.5" disk. Largest are 1Tb ones from Seagate and WD, both have two models in that size.

 

[Daaaveee]

Great I'll take a look, thanks.