Well unless it's maybe using 1C07! Give me a while and I'll see if I can write something to read the real ID and try to take some of the unknowns out. Hellhammer, if you follow Fernando's trim method first to see if it's working IMO that would be better than hammering your SSD's unnecessarily If it doesn't work with the simple test, especially if you've rebooted after deletion, then it's not likely to work anyway. Also trim itself just tells the firmware to unmap the LBA's, it is up to GC to do the erasing at it's pleasure. IOW your test is really a combination of trim and GC and might vary with different SSD firmwares depending on how they handle the trim. I have tested both a 5-series (P55) and 6-series (P67) and confirmed trim working with drivers 11.0 to 11.5. Personally I prefer the RST drivers, 11.2 is not a bad choice IMHO.