I remain eager to see what is going to happen with the new flash optimized file system. I am interested in updating my NAS hard drives to the new format but wonder if the older Mac's on my home network will be able to access them. I hope that when High Sierra comes out, that for "El Capitan" at least, there will be an update that will allow it to access disks with the new format. Also, I wonder what is going to happen with the new pic and video formats change to the high capacity ones... will there be some updates for some of the older versions of the OS to allow them to consume them? I mean, we have sharing of photos and things through iCloud and Photos... but what if things synch up... and older versions can no longer access them? Maybe it will be just a bitter pill to swallow...when older Mac's cannot run the software ...and our shared libraries of videos and pics can no longer be referenced. Have not heard anybody address either of these two issues.