I removed my Samsung 470 SSD from an HP laptop that had Win 7 running. Trim was enabled automatically with Win 7. When I put it into my new Macbook Pro trim was not enabled. You can check by going into the Apple, then About, then More Info and finally into Serial ATA. When you scroll down you will see that trim is not enabled.( Without it, the SSD will fill up and slow down. Google it and see what it does). Groths.org had a Trim Enabler patch that worked perfectly. I downloaded it and clicked on it and it installed. When I went back into the Apple, etc I found that trim had been enabled. Kudos to Oskar. I dropped a couple of bucks on him from Paypal because I appreciate this kind of work. Maybe Apple will have trim enabled in the next OS, like Win7.