iaSTor is GOOD (Intels equivalant of msahci)
Partition alignment shows ALIGNED ( shows OK)
But I think your performance is LOW
There is a NEWER firmware revision - Ver 2.22. (2.15 is an older FW)
Also check your MB Bios ver, If old update it also. Check MB manuf website (support - downloads)http://www.ocztechnology.com/ssd_tools/SandForce_Based/
NOTE. Vertex 3 uses the Sandforce 22xx controller which means that to get advertized Sequencial performance you need to run ATTO (a HDD Benchmark) that uses data that is readily compressable - NOT REAL WORLD!!!
HOWEVER, SSDs do NOT like to have benchmarks run frequently.
ADDED with SSD Plus HDD Plus DVD Drive
SSD = C
HDD = D ( In fact I make my HDD D & E normally)
DVD = E (or what ever follows HDD(s)
IF System partition Shows up with a Drive letter, I just move it out of the way like Drive M