I have a Macbook Pro with the following specs: MacBook Pro 15-inch, Mid 2009 Processor 3.06 GHz Intel Core 2 Duo Memory 8 GB 1067 MHz DDR3 Graphics NVIDIA GeForce 9400M 256 MB 240.06 GB OCZ-VERTEX2 The optical drive was no longer working on this model when I purchased it off EBay. I decided to add a Samsung SSD 840 series 250GB in place of the optical drive. Researching online I found this adapter/bay on Amazon. The drive was working great for 2 months then it crashed. So I had it replaced. The problem though, is that now my computer won't recognize the drive, even in the disk utility. So then I went online and purchased a regular HDD off Crucial: Seagate Momentus HDD 1 TB SATA-300. The machine still does not read this drive either? I am getting ready to order and OWC data double, because I feel it might be the cheap hardware I originally purchased? The computer runs perfectly fine and all the cables are connected correctly, so not sure what is happening? Any help with this is greatly appreciated.