Dennis Lee Bieber  wrote:
> On Thu, 17 Oct 2019 23:03:45 +0000 (UTC), not@telling.you.invalid (Computer
> Nerd Kev) declaimed the following:
>
>>
>>They do sell SD cards which are supposably rated for continuous video
>>recording. I'm in no position to say whether or not that's just
>>marketing though.
>>
>
>        Class-10 card speed is rated for streaming video to a freshly
formatted
> card. However, that is based on a single active file in use, and FAT
> (non-journaling) file system. Current R-Pi uses EXT3 or EXT4 journaling
> file system with lots of small files getting in the way of streaming.
>
>>
>>Unless you're looking to mimimise power consumption to minimise
>>operating costs, or running from a UPS.
>
>        You probably want that hard-drive even more if you don't have a UPS...
> Having a hard power-drop on a Linux file system can corrupt it -- putting
> the active data on a hard-drive rather than the same SD card the OS is
> running from may make recovery easier (it takes some tricks to fsck the
> running partition(s), but with all variable data on a hard-drive you can
> boot with hard-drive dismounted, fsck it, then mount it for use).

I can imagine various solutions to those problems, and I haven't
found ext3/4 to be as fragile as you're making out. But in any case
it is easy to have a FAT file-system on a separate partition to the
one that the OS is installed on, and use that for the video
recordings. If it is actually the FAT-formatted first partition which
the Pi boots from, resized to be much larger than standard, then you
also get the advantage of the data being readable from Windows or
Mac, which I believe only support reading from the first partition of
an SD card.

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