I purchased the Seagate Momentus XT 750GB with a HD Caddy to add space to my Mac Book Pro 2011, 17", OS X 10.8 over the weekend. I have been fighting it all the way and have tried multiple things with no success. Initially it stated it could not wirte the last block. So I flowed a message board support and put it in my Windows Desktop and partitioned it and tryed it again but it could not initialize the disk. So I built a small open SUSE box and repartitioned it and created an ext4 file system and tried it again... no sucsses. I finally got a hold of a SATA to USB dongle and Disk Utility found it created the FS and it was happy. I moved a few GB of data accross to it with no issues. I put in back into the hdd caddy and it fails to recognize it. Just to veryify the caddy was ok I put in a 320GB drive and it worked like a champ.
So I am at a loss of what to try next.
I have seen other people saying that teh EFI driver was updated and many people Momentum disks failed to work after the upgrade. Any advice would be helpful. I really would like to use the disk.