What would you do in this case? The completely silent WD hard drive in my 24 inch iMac failed and Apple replaced it last week. They replaced it with a Seagate hard drive which made a continuous crunching noise and in a quiet room when my wife walked by she asked me, what is that noise? It was annoying me so I brought it back to the Apple Store and they replaced the drive again. I requested that they use the same brand (WD) as the original drive and they said they would request it but couldnt guarantee that. After 5 days I picked it up yesterday and checked and they replaced it with the same model Seagate drive as before. I brought it home and again, the same crunching noise, for lack of a better description. I guess what Im asking is, is it unreasonable of me to expect the machine back to run silently the way it was originally? When I called again yesterday a manager came on and told me that some hard drives make noise but the point is mine did not. An analogy would be if something broke on your car that was silent, if it then made a noise after it was fixed, even though it now worked would you be happy? They want me to bring it back a third time and listen in the back room to see if its not a normal noise. Point is the original made absolutely NO noise.