[TowerTalk] SDS Hammer Drills - Difference?

[Jim Miller]

OK, this is probably off topic, but seems it has been carried right up to this question.  Sorry if not.  Just tell me where to go.  I've been told before so I know the way.

I can't imagine a "normal" hammer drill  (I have a Milwaukee) working very well at all for installing ground rods.  Not nearly enough "hammering" (pretty miserable, actually) and can't turn off the rotation.

WHAT is the difference with the SDS drills besides the type of "Chuck" on it?????

Does it have a mode where it only hammers?

Does it do a better job of hammering?

What is the big deal with SDS anyway?

THANKS, Jim