Confused about disk gemoetry

[Tommy Forrest]

So I got a replacment 200GB HD sent to me.  Put it into the system and
fire up the FDISK util in /stand/sysinstall.  It warns me that I should
verify the drive information.  It presents me with 24321/255/63 and
warns that it should match what the firmware sees.  Well, when FreeBSD
4.8 fires up, it reports the drive as 387621/16/63.  When I attempt to
use those numbers it tells me they are wrong and won't let me do it.

What gives?

Who's right?