Create a normal floppy with dd?

[ThisMayWork]

I am trying to create a normal in size floppy disk with dd using the following

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dd if=/dev/zero of=os.img count=1440 bs=512
	dd if=boot.bin of=os.img bs=512 count=1
	dd if=kernel.bin of=os.img bs=512 seek=1

However, the resulting floppy is only 6Kb in size, which Virtual Box won't accept. Any ideas?
Thanks in advance!

[Nable]

Oh...

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       conv=CONVS
              convert the file as per the comma separated symbol list
[...]

       Each CONV symbol may be:
[...]
       notrunc
              do not truncate the output file

tl;dr: by default dd truncates output file, so you should specify conv=notrunc option.

[ThisMayWork]

Thank you, worked like a charm!