learn something good everyday , lower stripe size for HDD and larger stripe for SDD
tried every stripe from 32k and up to 2048k on ssd & larger to 512k & 1024K worked best
And ya write back cache is a boost , best to have an UPS with that option..
your OS looks to be vista or W7 default install with both = aligned partition
XP default is unaligned partition , that is to say anyone using XP.... aligning your partition before install of XP really helps the IO's