High-end SATA SSD's top out at ~200 MB/s (avg. read) - so either your measurements are flawed, or I'm extremely jealous of your storage setup.

Since we're talking about performance, we'll need some good benchmarks to come to any rational conclusions. Naturally we can assume that opening 200 files isn't going to be as fast as opening a single file - just be virtue of having to call CreateFile 199 extra times. But that overhead could be completely "washed out" in comparison to time it takes just to process all that data.

What are you doing with this data that you're reading?

gg