Thread: backing up MBR using dd

hi, came across guide wish install windows along side installed ubuntu. so, mbr need use dd command. read manual failed understand something:
if run command

php code:

dd if=/dev/sda of=/mbr.bin bs=446 count=1 


mbr, back-up file be?
command doesn't specify. recover, saw need run

php code:

dd if=/media/sda/mbr.bin of=/dev/sda bs=446 count=1 


, after running first command there no file in there.
said, question file, , after recovering mbr, grub automatically load boot menu screen?
hope clear enough, thanks!

of=/mbr.bin translates : out file = /mbr.bin
mbr.bin filename , edit: disregard text in red, it's incorrect.
it's in whatever directory in when ran above command.

corrected: mbr.bin filename, , / suggests, located in root '/', directory

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