Wot's wrong with the display?

Strange Kindle Paperwhite 2 behaviour when borrowing Kindle Unlimited content. I tap the "Read fo $0.00" button & it claims to be downloading the title but nothing happens. Instead I have to go back one stage & reselect "Read for $0.00" upon which a message pops up saying "our records show you have already have this book" before actual download option appears.
Normal purchased content downloads immediately upon selection.

@kdfrawg This one:

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New version of SuperDuper! app is out: this one really works well with High Sierra APFS systems: you choose which of several local snapshots gets cloned.

Momentary panic a few hours back when I refuelked the car. Couldn’t find the Lumia 1520 I thought was in the glove compartment- needed to enter the fuel usage in an app on it.
Then I remembered I’d used it as a GPS navigator and almost fully discharged the battery because the charge cable in the car wasn’t connected properly.
The phone is in a bedroom at home, having been recharged. The Qi wireless charger wasn’t pumping out enough amps to increase the charge, so I had to connect physically.

Five years and one month ago I was playing an audiobook in the car when I was involved in a nasty collision with a truck.

I still haven’t finished that audiobook, haven’t even opened it since.

??

Where ya headed?

When I set up a Mac I make sure that all drives/volumes appear on the desktop and that they are sorted by name. That way, whichever is chosen as the boot-up drive appears in the top right corner of the desktop.

That's mighty odd. Part of my backup routine on the Men's Shed iMac is to perform CCC & Time Machine backups to partitions on an external HD & another CCC backup to an external USB 3 SSD. When booted from the latter none of the apps try to work from the internal HD.
As for erasing the internal, can't you just select it from Disk Utility and erase it from there?