The Natural Philosopher  wrote:
> On 20/10/2019 02:01, Computer Nerd Kev wrote:
>> The Natural Philosopher  wrote:
>>>
>>> In my own pi the SD card contains no moving data of any importance. Only
>>> logs IIRC.
>>>
>>> Everything else is network mounted. And the network server is a linux
>>> PCX86 with NO AUTOBOOT ON POWER!!!
>>>
>>> Or you could use a SATA USB drive.
>>
>> Running the system entirely from RAM is another solution. Tiny Core
>> Linux does this, and has a Raspberry Pi build. I'm not sure if
>> anyone's got it working with the Pi4 yet though.
>>
> You still need to boot it off SD

But the partition with the OS can be mounted read-only (or not at all
once everything has been loaded to RAM), so a power failure shouldn't
corrupt any data required to boot.

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