Might a Stream write less than the buffer size?

The intellisenses for Stream.Read and Stream.Write are very similar. Which leads me to the question of whether Write has the same gotcha as Read - It reads at most as many bytes as in the buffer. Not necessarily filling the buffer even when there are more to be read.

MSDN doesn't seem to say that there is. But I'm still asking because this is a tricky "feature" - since it usually works fine - one might not encounter it while testing.