Has anybody done a clean install and then used Migration to get their data to the drive on an external drive? Is there something hidden that I need to do/check/uncheck/fix/sprinkle fairy dust on?
I made an initial post earlier today in response to this, but have not seen it. Also, I hope I am not waisting my time with the following information. So, here goes.
First, let me say that I am posting this in my Catalina "environment". After doing my usual weekly tasks with Onyx, Tech Tool Pro, and SuperDuper! earlier for both of my Macs, I started the process to try and answer Jake's last question there, from my Mojave Mac Mini. That is, after copying all the TV Series files I had on my Samsung 860 EVO 500 gig external SSD to a flash drive, I launched Disk Utility on the Mini to Erase and Format that Samsung External SSD as APFS. No problemo, as Arnie says! When I then "asked" Disk Utility to partition that SSD, a dialogue popped up, suggestion that it is easier to just add another Volume to that SSD, as all such APFS volumes share the space. So, that is what I did, and voila, the SSD had two volumes on it, both the same size, 500 Gig (remember, the size of the SSD is 500 gig).
I renamed one of those volumes to "Catalina Test". I next downloaded the complete OS 10.15 Installation file from the App Store, and quit the process when the download was done. I made a copy of that Installation file to another location on my MIni, and removed the one inside the Applications Folder (no sense waisting space). I then launched that installation file, and did a clean, fresh, "virgin" installation of Catalina onto that external volume "Catalina Test". At the completion of the installation, (as expected) it asked me if I wanted to migrate information from another Mac, a Time Machine Backup, or another backup. I chose that, selected the internal SSD inside my Mac Mini, and away it went. Took a little time, but it successfully completed. All my apps, files, settings, etc. transferred fine (even my 2 32 bit apps Quicken 2007 and Magic Number Machine, although they are kind of "greyed out" on my Doc (no surprise there)).
I have tested some applications, and they seem to work fine: Google Chrome (the browser I am using for this post), Thunderbird, and VLC. "iTunes" is fine. I printed a document from LibreOffice, and my printer is happy!
I might run a few more apps, but I prefer to wait until at least the .1 version of Catalina arrives. What I would appreciate is if someone could explain the benefits, drawbacks, etc. of just adding another volume to an APFS formatted device instead of doing an actual, old fashioned partition.