> Should I flush after every line of data?=20
> Or should I flush after some amount that ties to block- size, etc?

This must come down to how much RAM you have available and how often you ar=
e writing a line of data.

If writing a line every minute (say) to log temperate and pressure, then wr=
iting to the card on every line would be OK, as the card will then deal wit=
h a sectors worth of data write to the Flash, and it won't take a minute to=
 do that, so it will be ready in time for the next line write.

But if the speed of your writing means that you are writing a line fast eno=
ugh that the next line write attempt will occur before the card has a chanc=
e to write a sectors worth to Flash, then buffering would be a better idea =
- until you are wanting to write a sectors worth faster than the card can h=
andle ...
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