Sorry I can't help, just bookmarking this in case it's the same problem as I have.
I only have one HDD, the original 4 yrs old!
Like you, I get a buzzing noise like a wasp trapped under a glass until the desktop (XP home SP2) has built.
I'm being told that the drive (which does have 2 bad sectors) is dying!
I also have the additional problem of random freezes in IE7 and have to do many hard shutdowns, which can't be helping!!