I would assume this TRIM support will expand to include all SSDs once Lion escapes later this summer. Early reports state TRIM support only works for Apple-shipped SSDs and not third-party SSDs like my Intel X25-M. The big question is what SSDs Lion's TRIM command will support. Lion System Info - Listing X25-M with unsupported TRIM Then update to Lion the day it comes out to get TRIM. If you want to get a new SSD before Lion ships, 1) wait until next month when all the 'next gen' controller SSDs come out and 2) keep at least 20% of your storage space free so that wear leveling works better. This combination also helps reduce write amplification (increased number of flash writes incurred from needing to erase blocks before writing new data), a factor in random write speeds. TRIM tells the SSD what data should be ignored by GC and is in use by the filesystem.

TRIM affords OS-level garbage collection and helps with wear leveling and fragmentation otherwise SSDs must blindly assume that blocks written to at least once are still in use by the OS. Now is an especially good time to give SSDs a chance if you haven't taken the plunge yet - very smart SSD controllers are emerging that are phenomenal at keeping performance degradation at bay. In short, TRIM support is a great thing for SSD owners and will keep SSD performance degradation to a minimum and ensure maximum possible life. unfortunately I won't see all the benefits in my SATA 3 Gb/s MBP. I'm waiting for its big brother, the Vertex 3 Pro with a SandForce SF-2500 controller, to come out next month.

Ssd enable trim mac os x