Installing 9.1 without re-partitioning hard drive

[leeoliveshackelford at surewest.net]

Good evening, Free BSD enthusiasts.  Thank you to each of the several people who have responded to my previous messages.  I have made significant progress, but am now flummoxed at the installation of the boot loader.  The handbook says to run this command, "boot0cfg -B ad0".  When I run this command, I get the following error message:  "Unable to get providername for ad0".  What is a provider name? How do I determine the provider name for ad0?  How do I communicate that information to boot0cfg?  I know that this problem has something to do with the "geom" command, but the "man geom" goes on for many pages.  While I think the answer may be in there somewhere, I could not find it.  Any and all comments will be appreciated.  Sincerely, Newby Lee