This may be a silly question, in which case I apologize beforehand. I've checked, and Trim is enabled for my SSD (came with the laptop, a May 2010 MBP). The question is, do I actually need to perform a "trim", or does the OS X Lion actively trim the drive? I assumed I had to use Disk Utility, and click "erase free space", but that option isn't active. I'm a bit confused. Thanks in advance.