In the format you are using below it will do a raw copy of data - any
partitions or formatting previously defined on sdc will have been
overwritten by whatever was in stick.img (I'm assuming this was a raw image
in the first place)

Martin

On 14 July 2010 09:37, Phil Thompson <p...@yarwell.demon.co.uk> wrote:

> A question arising from my Hackintosh efforts.....
>
> If using dd to copy an image to a device - say an img file to a USB stick -
> does the transfer occur at the lowest level or is the image written to the
> partition / format structure that exists.
>
> My expectation was that if I dd an img file to /dev/sdc (a USB stick) that
> it would end up with the partitioning, MBR and file structure as defined in
> the img file ?
>
> If that is the case, why do I see tutorials that go on at length about
> formatting sticks and using the right file system / partition table type,
> only to then splat an image on them with dd ?
>
> For clarity I'm taling about a simple dd command like
>
> dd if=stick.img of=/dev/sdc
>
> without any qualifying parameters
>
>
> Phil
>
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