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From: Hannu Koivisto <azure AT iki DOT fi>
Subject:  Raw device access to an SD card
Date:  Thu, 05 Mar 2009 17:49:59 +0200
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Greetings,

The goal is to create a bootable Linux installation on an SD card
by writing an existing image using dd in Cygwin.  The card is
inserted to an SD card slot of a laptop and apparently appears as
\\.\physicaldrive2 to the OS.

Now, "dd if=\\\\.\\physicaldrive2" reads something (hopefully from
that card, hard to say for sure) but an attempt to write with "dd
if=image of=\\\\.\\physicaldrive2" fails with "Invalid argument"
error.  Should this work?  Is there something that one must do
first?  I tried "mount -f -b //./physicaldrive2 /dev/foo" as
suggested by someone but according to the Cygwin user's guide that
is deprecated and besides, /dev/foo behaved just like
\\\\.\\physicaldrive2 directly.  FWIW, I tried to find if the card
device gets mapped to some /dev/sd? but that didn't seem to be the
case.  Only /dev/sda was available (hard drive).  Is it possible to
list that kind of mappings somehow?

-- 
Hannu


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