microSDHC class 4 or class 6?

Mikko Rauhala mjrauhal at cc.helsinki.fi
Fri Jul 18 22:26:04 CEST 2008

pe, 2008-07-18 kello 15:14 -0500, Hans L kirjoitti:
> On Fri, Jul 18, 2008 at 2:26 PM, Andrew Burgess <elist at cichlid.com> wrote:
> > Can the Freerunner make use of the class 6 speed?
> >
> > If not I'll go for the max size.
> According to http://en.wikipedia.org/wiki/Secure_Digital_card#SDHC
> Class 4 supports a minimum write speed of 4MB/s, and 6MB/s for class
> 6.  Not sure how fast the Freerunner is capable of writing though.

According to raster¹ the glamo (which is also the SD card controller)
bus speed is "7.3m/s" (I presume from context he means megabytes). This
with the cpu doing nothing else besides transferring data to or from the
card; thus in practice I don't think the class 4/6 distinction is going
to matter much on the FR. I would go for the size (and did, with my 8 GB
class 4 card).

But, I haven't experimented with the different classes, so grains of
salt and all.

¹ http://lists.openmoko.org/pipermail/community/2008-April/016518.html

Mikko Rauhala   - mjr at iki.fi     - <URL:http://www.iki.fi/mjr/>
Transhumanist   - WTA member     - <URL:http://www.transhumanism.org/>
Singularitarian - SIAI supporter - <URL:http://www.singinst.org/>

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