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   From: Garry Knight    
   Subject: Re: Copy/Clone bootable CF card   
   Newsgroups: alt.os.linux.ubuntu   
   Date: Mon, 12 Feb 2007 19:45:36 +0000   
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   ecikweise@yahoo.com wrote:   
      
   > I have a bootable CF card that I need to make a copy of for backup   
   > purposes. It boots a linux router, and I need a copy in case the CF   
   > card fails. The copy should be 'exact' so that it is able to boot the   
   > router computer by replacing the failed card. Any way to do this?   
      
   The usual way of cloning a drive is with the 'dd' tool. I've never   
   personally tried this with a CF card or any other type of flash memory   
   card, but I don't know of any reason why it shouldn't work.   
      
   Your card probably appears as something like /dev/sda1 depending on where   
   you plug it in (USB slot or memory card). So you would normally clone the   
   partition with:   
           dd if=/dev/sda1 of=cf-card.img   
   But since it's a bootable card, you might need to clone the whole thing:   
           dd if=/dev/sda of=cf-card.img   
      
   The above commands read the partition (or drive) device into a file that's a   
   bit-for-bit image of the device. You then write that image back out to   
   another card with one of these:   
           dd if=cf-card.img of=/dev/sda1   
           dd if=cf-card.img of=/dev/sda   
      
   Make sure you use the correct matching command: with /dev/sda1 to clone just   
   the partition, /dev/sda for the whole drive. And make sure you get the   
   commands the right way round: 'if' means 'input file' and 'of'   
   means 'output file', so you want 'if=/dev/sda' in the first command   
   and 'of=/dev/sda' in the second.   
      
   If I were you, I'd try each pair of cloning commands and then try booting   
   from the cloned copy. The worst that can happen is a) it won't boot, so   
   you'll have to do some more searching/Googling; b) you might need to   
   reformat the card you've cloned onto.   
      
   --    
   Garry Knight   
   garryknight@gmx.net   
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