Linux command: dd

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dd

It's used to manage images (create / dump)
To dump an image to a device (WARNING, IF YOU ENTER THE WRONG DEVICE IT WILL BE OVERRITEN)

dd bs=4M if="/home/linux/2013-02-09-wheezy-raspbian.img" of=/dev/mmcblk0

To create an image from a CD:

dd if=/dev/cdrom of=/tmp/cdimg1.iso

(*) Note: The cdrom must not be mounted.
You can check the image with md5sum.

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