I don't know if this is the right forum or not, but since I did this on a MacBook Pro, I'm posting this here. I have an MPB 2009 model with Snow Leopard, with a Corsair P128 SSD. This is an early model without Garbage Control and Trim. These last few months I've noticed that some processes started to hang occationally, for instance watching flash videos on youtube and playing computer games like Half-Life. I noticed the same problem on two different partitions on my P128 drive, both in Windows 7 and OSX 10.6. I bought iDefrag, and did a full defrag, and lo and behold - the stuttering and hanging processes (video, gaming) is gone! So, it seems it's just as I've always believed - defragmenting an SSD might actually make sense. HOWEVER, if you own a newer model with TRIM and GC I would NOT try defragmenting. Also the newest models have an insane IO/per second capability, so these models doesn't compare very well to my P128. For older SSDs however, this seems to work as far as I can see!