the "dd" command
 

dear all,
can anyone explain for me how command "dd" operator?

This is as far as I can help you.
http://www.linuxquestions.org/questi...ommand-362506/

http://www.linuxquestions.org/linux/...ything_With_DD and http://www.linuxquestions.org/linux/...ommand_line_dd and http://www.linuxquestions.org/linux/...files_using_dd may be a good start. http://en.wikipedia.org/wiki/Dd_(Unix) and http://www.codecoffee.com/tipsforlin...icles/036.html and http://www.linuxjournal.com/article/1320 would also bear reading. DD is a powerful tool and it really depends on what you plan to do with it.

Welcome to LQ.