[App_rpt-users] Need help DD command

[Doug Crompton]

Robert,

 All that info is on the hamvoip site in howto's but I will repeat some highlights here.

To copy an image to an SD card you insert the card into a reader/writer (usually a USB FOB)

In Ubuntu it should mount the device. Do a 'df' at the Linux prompt to see how it is mounted. In my case on my Ubuntu laptop the main hard drive is /dev/sda1  and the SD card comes up a /dev/sdb

In any case make absolutely sure you have the right device. dd is NOT forgiving and will just a happily write to your hard drive or another device.

The assuming you are in the directory where the image resides you do the following:

dd if=nameofimage.img of=/dev/sdb

Of course you replace the filename and output device with your values.

To make an image from the SD card you would do the following:

dd if=/dev/sdb bs=1024 count=3900000 of=nameofimage.img

Again use your values.

Also be aware that the 1.2.1 code has a very nice backup system built-in  Read the backup howto on the web page.

Also BBB related questions should be asked on the arm-allstar list. You can join the list from a link on the hamvoip.org web page.
73 Doug
WA3DSP
http://www.crompton.com/hamradio


> Date: Wed, 14 Jan 2015 21:48:44 -0500
> From: N1XBM at amsat.org
> To: app_rpt-users at ohnosec.org
> Subject: [App_rpt-users] Need help DD command
> 
> I recently set-up a BBB. When getting the image from www.hamvoip.net I 
> tried use my new installation of Ubuntu 14.04, mostly because I am 
> trying to learn Linux by just using it. I didn’t have any luck and just 
> to keep the project moving I resorted back to windows to complete the 
> image copy.
> 
> I would like to learn how to copy a .img file to a micro sd card using 
> DD. I would also like to know how to do the reverse of taking a micro sd 
> card and making a .img file for backup.
> 
> Is there anyone on the list willing to help me with this?
> 
> Thank you
> 
> Bob/N1XBM
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