^^
IMO I don't know about Buffalo RMA but there have been sporadic reports of difficult RMA on WD HDD's (even after they having a door-to-door service, just weird) HDD not returned for months, one of my friends internal 1TB Green Edition took three months to get back to him after the low level guys couldn't figure out what went wrong and were reluctant to forward the piece for a through examine to their Delhi labs.