Customer Support promptly sent a replacement fan for my new PBO. Thank You! However, after the required total disassembly of the PBO to replace the fan, I found the new one to be almost as loud as the original. After several days of new fan'burn in', I decided to open the case and try a drop of lube. It only took a minute to open the case and gently remove the sticker covering the fan's bearing. One small drop of lube and WOW! It is practically silent! I can't distinguish between the Seagate HD and newly lubed fan as to which makes most of the nearly totally silent PBO. I can only hear slight noise when my ear is within a foot of the unit. The high pitched whine of the fan is GONE. Thanks to this forum for suggesting a drop of lube. I would not have thought a new fan would need it. But it WORKED!