When pointing someone at this FAQ at
formatting link
, I noticed an error in it..."Hammer only, no rotation Not all models have this (sometimes the ones that do are called SDS+ drills). "
I believe this is incorrect. SDS+ (or SDS Plus) refers to one of the types of SDS chuck, of which there are (or rather, were) three formats:
SDS Original, became obsolete and vanished before SDS drills became widespread.
SDS+ (or SDS Plus) The most common format with two splines and two dimples on the bits, often now simply called SDS as the original SDS format has vanished.
SDS Max Larger chuck found on more powerful SDS drills, with (IIRC from memory)
3 splines on a slightly conical rear end of the bits.