I have long been in the habit of keeping a diagram of my computers and drives, partly for my own benefit and partly for whoever finds themselves in front of my computer when I become incapacitated. I tried various apps over the years but never got on with them, but recently tried Apple's Freeform app which I have found very easy to get to grips with to knock up the current diagram below for example. This is a very simple use of Freeform (it is capable of much more) and I found it very intuitive, and did not need any help outside the app. I am sure there are things about it that would frustrate a power user of such apps but for the casual user it is very accessible.
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