Originally Posted by
dedhed
FWIW "Hollowtech" came in 3 varieties.
HT I- square taper
HT I - Octalink
HT II - 2 piece with external bearings.

+1, I've owned examples of all varieties as well. It does seem odd that they named the latter bottom bracket standard "Hollowtech II", which really has nothing to do with the patented "hollow" construction of the crankarms themselves. That's caused more than a little confusion over the years.