I have a general question about a recently upgraded 2006 Mac Pro. I recently upgraded my boot drive to a 1TB Western Digital 7200RPM sata drive. I have a 2.66GHz Mac Pro late 2006. Running leopard. 4Gb Ram. Radeon 4870 HD (recently added). two other sata drives as backup. (200GB and 350GB, about 4 years old) With the new drive I notice an odd clicking sound when ever I shut it down or send it into standbye. Like the drive is just stopping instead of spinning down... I have heard that this can cause permanant drive failure... Is this an issue I need to be concerned with? thanks!