which disk to erase in Catalina for fresh reinstall
Having tried recovery and failed (due to lack of knowledge and finding more discs/volumes). In fact tried 2 times using cmd-R first time selecting Mac HD and second time selecting Mac HD Data. All got very confusing and nothing appeared to help speed up the system. I was advised to do this by apple help engineer on line. He said my Mac should be whizzing through al the programmes and applications and felt that a fresh install would clear the problem. I have not needed up with this..... so confused - don't know which disc to erase, recover or anything.. expert help required please! I guess what I need to know is what discs to erase and which one to install on.