> This is what I suspected, and is why I'm looking for an alternative. I'm
> checking into eMMC as suggested earlier. I'd be happy to stick with 1-bit=
 but
> the libraries I've looked into supposedly can't achieve the speed I need.
>=20
> I would consider paying for licensing if it can be done on a per-unit wit=
h a
> reasonable or no minimum.

My understanding is that to use the 4 bit mode, or even to just get the inf=
ormation you need to become a member of the SD card syndicate. Then you get=
 access to the relevant specifications, and the membership fee is the licen=
ce fee. I believe that is how they work it.

> Speaking on licensing, will I need to license the use of FAT32? Anyone ha=
ve a
> decent library to recommend?

My understanding is you don't need to license FAT32, but if you are going t=
o use long filenames you need to license that from Microsoft.

I believe the Microchip MLA and/or Harmony have a FAT32 library.

But perhaps the other question is why use SD cards? Could you not use USB s=
ticks? There is enough library code around to run USB OTG on various micros=
, and some of the units can do it reasonably fast. Although I haven't done =
the math, I really doubt you need a lot of speed to record audio at the rat=
e you want.

--=20
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