It’s an HDD. Cheap, spins, keeps your data safe. You should have a few in your system unless you need absolutely silent computing for your recording studio, in which case I’m not sure why you’re here.
We like to recommend Toshiba and Hitachi HDDs over Seagate and WD, because the numbers from several wide spectrum evaluations put them at the lowest failure rates year over year (other than HGST, a subdivision of Hitachi that was bought out by WD recently) and they’re also consistently cheaper per GB. We periodically update listings with best price/GB drives in the table above, so be sure to check back every once in a while if you’re looking for a bargain.