Watch the C Minor Pentatonic online guitar lesson by Brad Carlton from Guitar Lab: Scale Form Logic Vol. 1
The sixth string root pentatonic scale form is the most common scale form. This is the one that everybody learns within the first few months of playing guitar. In my system of labeling pentatonic scale forms, I do not use the first string. This two note per string scale form will always have the root on the six string, and if you consider the root with your index finger, you'll be playing minor pentatonic. If you consider the root with your fourth finger, you'll be playing major pentatonic.