[ubuntu-uk] mbr removal command

[norman]

As a result of my research into the complete removal of the MBR I came
across the following command:-

dd if=/dev/zero of=/dev/hda1 bs=512 count=1

I have 2 questions and I would be grateful for answers, please. Firstly,
as I have only one hdd and that is a SATA drive, should I substitute
sda0 for hda1 and, secondly, does it matter which comes first bs=512 or
count=1, I have seen both and so am confused?

Norman