On Wed, 14 Nov 2012, Mike Clarke wrote:

On Wednesday 14 November 2012 19:43:30 Fernando Apesteguía wrote:

If I boot the system and plug the SD card in, the green led
doesn't even switch on and there is only a /dev/da0 that I can not
mount. If I boot the system with the card plugged in, the green led is
on and there is a /dev/da0s1 device that I can't still mount because
mount_msdosfs returns an Input/Output error after some time.

I think that's pretty much standard behaviour. The solution appears to be
to "wake" it up with the following incantation:

    dd if=/dev/null of=/dev/da0 count=0

That's what works here. See the thread starting with
<http://lists.freebsd.org/pipermail/freebsd-questions/2010-February/212109.html>

true > /dev/da0

is a little shorter and safer. The search keywords for this are "GEOM retaste" or "retasting".
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