On Tuesday, October 30, 2012, Neil wrote:

> I'm writing ongoing CSV data (logging) to an SD card, and wondering if
> there are any guidelines for when to periodically flush the data to the
> card.  Should I flush after every line of data?  Or should I flush after
> some amount that ties to block-size, etc?  Is there any good doc
> floating around the web that has good guidelines or best practices for
> this?
>

I don't think it matters either way. Optimizing flushing is done to speed
up I/O and minimize wear on the SD card when possible. But due to the
nature of your data and the way it's being written, there's no point
delaying a flush.

I would flush after every block or so and opt for simplicity since there's
absolutely nothing to gain by trying to optimize I/O.

Partly related, I still can't believe that the SD card interface spec
hasn't been leaked yet. Or I just haven't found it.
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