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I brought 9.5 mm SATA Optical Bay SATA Hard Drive Enclosure and equiped SSD (crucial Real SSD C300). Then I attached the enclosure unit in place of Optical drive, but MacBook can’t recognize this SSD drive. I was pushing “Option” key in booting, no drive icon appeared. Although I equiped SATA HDD (Segate 320GB HDD) to enclosure unit and attached it, MacBook can recoqnize this HDD. I tried two SSDs, but neither can’t be recognized by MacBook. I also tried to attach these SSD to 2.5 HDD connector (next to battery), then MacBook recognized this SSD. What should I do ?

You’re going to have to format the drives for use. Get a Snow Leopard DVD, and boot it pressing C or Option and selecting the DVD. After you get it booted, you’ll want to look under Applications or Utilities, and select Disk Utility. After you load it, you will need to wait for it to recognize the drive/s. That said, it can detect which ones need to be initialized in some cases, but not all so be careful if it doesn’t. You will want to format in MacOS Extended (Journaled).

I have the same problem - neither the SSD or a 7200 RPM 3.0Gbps HDD will work on the optical SATA port, but work fine on the regular slot. Oddly Apple aren’t that interested in helping :-)

Similar problem here. I can hear the hard disk spinning, but the enclosure doesn’t even show up in System Profiler. Any solutions?