Hi everyone. I'm fairly Technical, I just can't seem to figure this one out. I own a 13 Inch Macbook with the stock 120 GB HD. It was purchased this past September 2008. I bought a new HD from Newegg. Here is the link to the HD. http://www.newegg.com/Product/Product.aspx?Item=N82E16822136197 I read the reviews, and more than 20 reviews I read said this HD worked perfectly in their Macbook. -So I received the HD yesterday -I put it inside my laptop -I put in the OSX install CD -I powered up and held down C and booted into OSX Installer -From the menu i selected Disk Utility but the hard drive does not show up as listed hard drives FYI - after all attempts failed, I put the disk in my windows machine as an extra sata drive, and it booted perfectly fine, so I know the disk is ok. Some other thoughts? -The difference between the stock and new HD is size and also 1.5 GB vs 3.0 GB Transer rate -Does my Macbook need a firmware upgrade - I doubt this, but just a thought -Does the Macbook not recognize unformatted disks - I doubt this too any suggestions?