I've already done it. switch the hard drives and reboot, that's all. Working without beachballs XD
I have the startup set to the SSD in the optibay.
I'm on a Macbook pro 13" Late 2011.
Hello Carl. What have you done after switching places between the two drives? Can you explain it with more details please? I have the HDD in the hard drive place, and an SSD in the optibay, and I have a lot of freeze / beachball. Thanks.