I bought this PSU in order to replace my broken LaCie PSU.
I noticed that my 4 year old 500GB LaCie d2 Quadra wasn't spinning up properly, and that my PSU was making a hissing noise; I contacted LaCie support, and they concluded that my PSU was broken (which was causing the problem) and needed to be replaced.
I bought this PSU, because the LaCie brand PSU was double the price, for essentially the same product. So I bought this product, and it works absolutely perfectly. My hard drive now spins up and works as normal.
This PSU works consistently and perfectly with my LaCie d2 Quadra.