Just saw this post at adafruit:
learn.adafruit.com/read-only-raspberry-pi/
I think it would be a good idea to add this option to Volumio.org if possible… This way the less tech minded people can power down a pi in the same way the power down an Amp.
Volumio does not need this: the system runs on RAM, and SD Card is written only when saving settings
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amazing.
Thnx, I use a powerbank that cuts the power to all appliances (cd player, gramophone, little lamp) and volumio pi when I power off the Amp.
so far I always needed to shutdown the pi before switch off the Amp.
But no longer!
Thnx again for this info.
Just tested your statement. That is not true.
Volumio version: volumio-2.389-2018-03-26-pi
RPi3
IQaudIO Digi+
Turned off the power for RPi3(Volumio 2.389) without shutting down Volumio from Web interface.
Volumio is not accessible anymore. I guess I have to write SD card again. This issue is not solved 
anymore clarity on this?
At Moode they say that:
There is a recipe for running moOde under the overlayfs read-only file system which IIRC works but has not been reproduced and tested by others.
The main drawback to RAM / read-only mode’s for OS’s is that you have to go through hoops and revert to read-write mode every time a setting or option is changed, then revert back to read-only mode. IMO it’s a convenience killer plus added complexity without a matching compensating benefit.
Then Volumio obviously implemented it with a bit more sense😀.
I think you might be mixing squashfs (read-only) and overlayfs.
The overlay filesystem allows you to dynamically create a filesystem (overlay) with a read-only squash filesystem and a writable data part without “going through loops”.
The overlay is re-created at every boot start before Volumio is started up, for Volumio it is a normal read-write system.
Hey there,
i had the same problem.
I solved it by just using a MicroSD to SD Adapter in a SD to MicroSD. ^^
The Different is that y can switch the writeprotection on at the MicroSD to SD Adapter.
Old SDs had a small switch at one side. The smaler MicroSD did not have one.
Sometimes its simple like that.
Regards Richard
In this case, you can’t configure, install plugins, save last state in volumio.
Yap, of course.
Isnt that the desire?
If you have to change something, just switch it back. And when you are on the WebUI, you can shutdown prooperly.