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   NNTP-Posting-Date: Mon, 12 Feb 2007 15:19:21 -0600   
   From: ecikweise@yahoo.com   
   Newsgroups: alt.os.linux.ubuntu   
   Subject: Re: Copy/Clone bootable CF card   
   Date: Mon, 12 Feb 2007 16:19:22 -0500   
   Message-ID:    
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   Yes, it worked, thanks. I had to use /dev/sda for the whole card,   
   worked great.   
      
   On Mon, 12 Feb 2007 19:45:36 +0000, Garry Knight    
   wrote:   
      
   >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.   
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