Maybe it's just me.....but this seems like a lot of trouble to go through just to eliminate a bit of noise.
Honestly......how much noise can a laptop HD make? It's not like you'll have to crank you TV up louder to hear it over the drive.
Am I missing something here? What kind of laptop do you have? Is it older? What makes the HD so loud? Perhaps look for a new laptop HD which isn't as noisy?
I have buy a new Hard Drive, now it's ok.
The only "noise" that still exist is just from the fan for the processor ( an Athlon 64 3000+ ), but it is really not a problem