what is the difference between the two?
and also i have a real slow pentium 2 with like 4 gb of hard drive space to what is a good distro for a beginner that would fit well on that HD space, or do all of them? well than one that would be still fairly fast.
The people that did STD removed some programs that came with Knoppix, and then added security tools. Hence the STD, which stands for Security Tools Distribution.