I'm using 2.5-inch Samsung 250gb 5400 rpm HDD, that I salvaged from my old laptop. The only reason I'm using this is because I was constrained by my budget during the build (tax, assembly fees, etc etc) added up so quick that I ended up with this old, slow, noisy HDD,. This is my first PC ever and I guess I have not saved up enough for it. Hope I will win though. Good luck guys Thank you so much for the awesome giveaway Linus and Western Digital.
P/S: I'm running the drive up side down in my case without mounting bracket (did not come with my case) and a folded tissue underneath to minimize vibration ~~. It's a struggle.