Thanks Neil!

If you're not limited by size you might want to consider writing to a
Compact Flash card. I don't believe there are any licensing issues and it's
a parallel interface. For me CF is just a little too big.

--
Sincerely,

James Burkart
*Filmmaker & Documentarian*

*Burkart Studios*
415.738.2071 | Phone
925.226.4910 | Fax

*Web:* burkartstudios.com
*Facebook:* facebook.com/burkartstudios

On Thu, May 12, 2016 at 2:46 PM, Neil <picdude3@narwani.org> wrote:

> James,
>
> I've also been concerned about the SD data rate for a data-logging
> device that I'm slowly working on, as I'm expecting to capture data just
> a bit above the max rate of the SD card.  But I really want the data to
> be on a removable data card, so I'm considering circular-buffering the
> data to a RAM chip, and streaming that out to the SD card at the lower
> rate.  With the 4GB SD limit, I won't need 4GB of RAM, but I've ballpark
> calculated I'd need just under 1 GB of RAM.  Just need to figure out the
> lowest cost option for the RAM. The values in RAM would be raw, then in
> FAT32 format only when it's on the SD.
>
> I'll also consider compressing the data as it may help eliminate the
> need for the buffer RAM..
>
> As for the FAT32 4GB limit, I'm pretty sure the next level (exFAT IIRC)
> is proprietary/closed/expensive, so perhaps format the SD card into
> multiple 4GB partitions with the partitions labelled so you can get them
> back in order?  This would depend on how you plan to retrieve them.
>
> Cheers,
> -Neil.
>
>
>
>
> On 5/12/2016 4:31 AM, James Burkart wrote:
> > I aspire to make a small audio recorder. I need to decide how and on wh=
at
> > it will record on, and how I will retrieve the files.
> >
> > I was originally considering having it record to microSD. Initial
> obstacles
> > I found were speed limitations from using SPI, and the FAT32 drivers I
> was
> > looking into will only access up to 4GB.
> >
> > FAT Driver I am reading up on.
> > *
> http://www.embedded-code.com/source-code/memory/secure-digital-mmc-memory=
-cards/secure-digital-mmc-memory-card-fat16-fat32-driver
> > <
> http://www.embedded-code.com/source-code/memory/secure-digital-mmc-memory=
-cards/secure-digital-mmc-memory-card-fat16-fat32-driver
> >*
> >
> > Alternatively I was considering having the recorder write to flash memo=
ry
> > and then retrieving the files via USB interface. I know next to nothing
> > about attempting this method. Immediate obstacles for me would be
> figuring
> > out the whole USB thing, and finding/writing FAT32 drivers for use with
> the
> > flash memory (or do I?).
> >
> > USB stuff I have found.
> > *http://www.signal11.us/oss/m-stack <http://www.signal11.us/oss/m-stack
> >*
> >
> > I would appreciate any thoughts or input, suggestions, sources to read,
> > what to consider, etc...
> > What questions should I be asking myself?
> >
> > Note: I would like to be able to record stereo 48kHz/24-bit but I will
> > settle on mono 44.1kHz/16-bit.
> >
> > --
> > James Burkart
>
> --
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