I installed an Apple SSD last week. I used carbon copy to clone the current startup disk to the new SSD. Everything was working great! Then I noticed a strange permission error and couldn't create a folder in Lightroom after a few days, so I made a mistake and set everything to read + write on the SSD including subfolders. After that I got a strange popup error about a .kext file. I thought no big deal, but then I got maybe 7 more errors about .kext files. When I rebooted the programs in the menu bar started disappearing. I rebooted again and everything was black, but I could see my mouse. Googling a bit I found out that these .kext files may be related to trim. Luckily, I have backups of everything so I was back up and running in no time. My next step will be to setup the Apple SSD as a clean install of Yosemite, but I want to make sure I am doing this right. Do need to create a small partition for a recovery disk, or is this done automatically? Do I have to do something special to make sure I am using Trim correctly? My current startup disk is an older 256gb SSD which has no problems right now, so maybe this isn't the problem. Any idea how I could have screwed everything up so badly?