August 2019 • Macworld 121HELP DESKsystem software, and they go through the standard
set of hardware parameter troubleshooting, such as
resetting NVRAM (fave.co/2xC6oor) and resetting
SMC (fave.co/2xzo302).
It’s worth trying, because it’s non-destructive.
If unexpected unmountings continue, try to make
a backup immediately. This may reveal other
problems, but it’s important you have as current
a copy of what’s on that drive as possible, as
the hardware may be about to die – or the drive
may at least be hard to access while you work
through solutions.
Here are five other possibilities and some
accompanying ideas for troubleshooting: