Hi there, I seem to be having issues with the SSD on my MBP mid 2014. 512 HD. I7 with dedicated NVIDIA card. 16 GIG RAM. First of all I use my machine mainly for audio production with Logic Pro X. The HD Usage meter on Logic shows a spike and audio and metronome skip when pressing Rec. No matter how many tracks I am running. This happens with just one or several tracks. With my internal card or external audio interface.Changing the buffer size makes no difference. No issues playing back just when recording. This started happening when I upgraded to Yosemite. When playing around with the disk utility I noticed that the erase free space option was clickable, something that is not supposed to be available for Solid state drives. I foolishly tried to erase free space which resulted in the following inconsistency. The process actually ran until it said my drive was almost full. Which is not. So my questions are: Why would the erase free space utility run on my SSD? How to you troubleshoot a drive? (I'm fairly new to Mac) What are my options here? I guess I could just fomat and reinstall, but that is a drag. Is Yosemite seeing my drive as a non SSD? I'm thinking this got something to do with the drive underperforming in logic. thanks!