I thought that like any *nix machine, my new mac mini would work just fine, when I ordered it with small soldered ssd, which would contain System and Applications and have everything else in external drives. Since you can use cheap, but fast usb3.1g2 ssd (10Gbit/s) or even faster tb3-ssd (40Gbit/s). Seems to be not so "optimal" solution. Something went wrong with migration from old mini's 2TB fusion drive. And then maybe copied stuff has permission problems. Maybe APFS isn't so mature yet? Apple's solution to this is mysterious undocumented command: Code: diskutil resetUserPermissions / `id -u` https://support.apple.com/en-us/HT203538 Problem with the command was, that it never got through and I guess there no verbose mode for this? Apple's support didn't know or couldn't tell anything about the command and whether it operates only in startup disk or in all disks or something else. After "taking care of things" Apple's support told me, after 2 months, that having Home Folder somewhere else, than in internal startup drive is not supported by them and if I want to get support from them, I need to move my home folder to internal drive. Anybody else heard about this limitation to support? You can still move your home folder anywhere you want in System Preferences. Has anybody found any documentation from Apple about this limitation? I haven't. Space used in my drives: INTssd (251GB): /Applications 87GB /Library 76GB /System 10GB EXTssd (1TB) homeFolder 333GB EXThdd(2TB) parts of homefolder: Movies 385GB Music 196GB Pictures 121GB Shared user 98GB tempWork folder 28GB All these were in cheap, fast, selfmade fusion drive in old mini. And now Apple wants me to put all this in internal ssd, id if I want their help to get file permissions fixed... Any thoughts?