It only means that dd will transfer 4M of data at a time bs stands for 
block size.


On 03/14/2015 07:03 AM, Michael Havens wrote:
> I've decided to try to run the operating system openelec. I was 
> wondering how big of an SD card I need for it. The instructions for 
> installation are:
>
> dd if=OpenELEC-Generic.x86_64-5.0.0-efi.img of=/dev/sdb bs=4M
>
> Does this mean the sd card needs to be 4 mb in size? Can I even buy 
> one that small? What about swap?
> :-)~MIKE~(-:
>
>
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