Geometry of my HDD

Hi there.
I'm trying to format one of my HDD and I use sysinstall->Fdisk and I got this message:
WARNING: A geometry of 969021/16/63 for ad6 is incorrect. Using
a more likely geometry. If this geometry is incorrect or you
are unsure as to whether or not it's correct, please consult
the Hardware Guide in the Documentation submenu or use the
(G)eometry command to change it now.

Remember: you need to enter whatever your BIOS thinks the
geometry is! For IDE, it's what you were told in the BIOS
setup. For SCSI, it's the translation mode your controller is
using. Do NOT use a ``physical geometry''.

This message I had also when I installed FreeBSD and I continued without doing anything and it works just fine.

Can I ignore this and continue with formating the second HDD?

most often safely ignored. That question comes
up often. (I tended to follow online install
guides which explain how/why to ignore it. do not
recall anything about it in the most recent installs
2 or so years ago. )
You can definitely ignore it, I'm not sure what problems it can cause, but in the many years I've used FreeBSD I've never known it to cause me headaches.

I believe that there are some windows programs that can get the information for you should you really need to. I think that in most cases the hardware handles that for you anyways.