<On Wed, 7 Apr 1999, Richard Erlacher wrote: <> I don't believe those were the earliest of the 5-1/4" types. The early <> SA-400's I remember used a lead screw just like the 8" drives, but that w the SA800 was lead screw but, the sa400 was the spiral groove disk. I know as I still have the working SA400 (not the later L) that came with the Northstar* MDS purchased in 1977 (very low sn#). Allison