There are a number of different "small SD" formats - mini-SD, micro-SD
and RS-MMC. RS-MMC is the one I've been using - it has a similar
physical connector to SD but is shorter. The others have incompatible
connectors but with the same signals AFAIK.

Wikipedia has some useful info:
http://en.wikipedia.org/wiki/Secure_Digital_card

Cheers,
Zik

On 11/7/06, Mike Harrison <mike@whitewing.co.uk> wrote:
> On Mon, 6 Nov 2006 22:22:05 -0000, you wrote:
>
> >I'm also working on another datalogger project, hadn't considered the
> >microSD, just normal SD cards, whats the power consumption level like
> >between the two.
> >
> >Mat
> >
> >-----Original Message-----
> >From: James Newton, Host [mailto:jamesnewton@piclist.com]
> >Sent: 06 November 2006 22:06
> >To: 'Microcontroller discussion list - Public.'
> >Subject: RE: [PIC] Interfacing a PIC to a microSD or TransFlash card
> >
> >> Are they cheaper, or is size at that much of a premium?
> >
> >Mostly the size is what makes it perfect for data loggers, but also the cost
> >is amazingly low and they could possibly be scavenged from old cell phones.
>
> I think MicroSD is electrically the same as SD - Sparkfun do some connectors, breakout PCBs etc.
> http://www.sparkfun.com/commerce/product_info.php?products_id=8163
> The spec on that page mentions a passive SD to microSD adapter, which would imply it's just a pinout
> converter (like PCMCIA to CF, ISTR)
>
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