I use an SSD in my MBP as the main boot drive. I am running an app called Keep Drive Spinning, a simple little app that writes/ erases a file to a USB drive attached to my AEBS once a minute. Keeping the disk awake improves the response of my aTV and iTunes when accessing the media files I have on the drive. It eliminates the lag while the drive spins up. My understanding is that the Mac will optimize the its internal SSD when the Mac is not used for a sustained period (like overnight). So my question is, if the Mac is writing this file every minute, does that prevent the Mac from doing it optimization of the SSD, as there is no long time that the Mac is not used?