Short story... I put Mountain Lion on my internal SSD temporarily (just to play with it). R/W Speeds were similar to those in Lion and Snow Leopard. Then a day later... I cloned back my workhorse and mainstay OS Snow Leopard from an external HDD back to the SSD and my speeds went to hell in a hand basket: Write was 250 MB/s. Now 150 Read was 500 MB/s. Now 125 I've scoured the web looking for ways to bring my Crucial back to factory freshness but nothing's worked. (The Crucial forums are pretty much a crapshoot for OSX users). For the first time in over a year, I've used the TRIM enabler for a week now and that does nothing. (Never needed it before). I also left my SSD idle for 2 days hoping the Garbage Collection routines that Crucial uses would do their thing like they have the past year. No luck. So... how do I nuke my Crucial M4 back to factory goodness?