I'm slowly moving all of my computers over to Mojave, with exception of one that'll remain running on HS. Therefore, I'll be updating to APFS on the lions-share of my various computer goods. This includes a few spinning externals that'll be used for TM backups and also simple data storage. I'm set to begin the process and I intend to wipe my externals clean as part of the conversion. It's my understanding that APFS is an optimization specifically designed to work with an ssd; will this cause any trouble with the spinners I have if I reformat them to APFS? (sorry if this is elementary but I simply don't know and don't want to run into any unforeseen issues) Thanks!!