1. get on ebay and buy a replacement drive, either a 8gb WD or 10gb Seagate depending on what you have in there now (cheap).
2. replace your noisy drive
3 . find slayer's installer 2.6 final, burn it to a dvd-r, boot it and have it recreate the original hard drive state (you will lose whatever games you have on there)
if your xbox is modded you can skip all of the above and just replace it with a hard drive of your liking. i recommend hitachi 7k250, the 200gb model.