But the poll forget the biggest brand; Hitachi (IBM)
ALL IBM hdd's are lockable; even the 2K250 series and others. No way that all seagates and Maxtor are loackable; it's a bit of a gamble to choose those.
Then also, in different tests (Anandtech, Tom's hardware) the Hitachi HDD's are faremost the fastest on the market. Sure, they are not alway the quiet ones like Seagate, but the new drives i hear also barely.
And last but least, IBM (Hitachi) are cheap.
The last year i've modded more then 50 xboxes, all with Hitachy (IBM). All kind of models, and they ALWAYS are lockable!