bsdlabel and layout related question



Good Evening,
I was just wondering why the 16 block offset of the a partition?

For example, when create a new FreeBSd slice (say ad0s7) and I run:
bsdlabel -w ad0s7
I will get ad0s7c with offset 0 - the very beginning of the slice, and ad0s7a with offset 16 - which starts 16 blocks away from the beginning of the slice.
Why is this gap there? What is its purpose, and why the size 16?
Is it related to boot code on the partition?
I couldn't find the answer for this, so I hoped somebody here will let me know or point me to a page that explains it.

Thank you!

Keve

--
if you need to reply directly:
keve(at)mail(dot)poliod(dot)hu
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