Any way to prevent my external startup SSD from converting to APFS as part of System update yet? Stack Exchange claims it's doable: How to prevent conversion to APFS on High Sierra install. But has anyone here done it? I expect perhaps some odd problems, maybe security update difficulties or Time Machine freezes. Yet I still have too many ineligible Macs to really want to toss yet in another weird disk format. -Yes, I still run Apps under system 9 emulation. No time to play right now. Perhaps waiting for 10.14 would be best?