Chosen Solution

Why my Macbook Pro can’t find my HDD (SATA) in the Superdrive bay (PATA)? I changed my original HDD by a SSD HDD? Then, I changed my Superdrive (PATA connection) by the original HDD (SATA connection) with a caddy PATA-SATA. My MacBook Pro can’t find my HDD but I can hear it running. Does anyone know what is the problem? Can the problem is the PATA-SATA adapter? Thanks!

Try switching the drives.