It appears that swapping out the optical drive for a HDD or SSD isn't as trouble free as we mac folks would like it to be. Finding answers is even more difficult given all of the different drive configurations and two possible boot drive locations multiplies the problem. I've personally spent way too much time and money on something that was meant to be a cheap upgrade. Does anyone have any trouble free configurations that they can share? I can start by listing what doesn't work, problem encountered, remedies that failed: Macbook:1,1 HDD bay:Intel 40GB x25-v OP bay caddy:newmodeus PATA-SATA OP bay drive:WD 500GB scorpio blue Problem:erratic drive behavior; excessive load cycling Failed remedies:hdapm (perhaps the PATA-SATA conversion interferes with this remedy?) Macbook:1,1 HDD bay:WD scorpio blue 500GB OP bay caddy:newmodeus PATA-PATA OP bay drive:Transcend 16GB SLC Problem:erratic kernel panic upon "light" sleep when lid is closed (hibernate off) Failed remedies:SmartSleep, "sudo pmset -a hibernatemode 0" What worked for you? What didn't?