windows 7 - Is my SSD disk aligned to 4k sectors and if not how do I fix it?

As per another post here on SU, I'm trying optimise performance of a USB 3.0 attached SSD drive. I've been told that aligning to 4k boundaries should improve performance(?).

So how can I check that and fix it?

(Windows 7 Premium)

Answer

Run AS SSD Benchmark and check if this value is green:

If it is green your SSD is correctly aligned.