====== Can not mount off the Large disk ======

This might be resolved by disabling the udma.\\
if you say that BIOSes provide switching between PIO0 to PIO4.\\
but there is no way to control UDMA in a BIOS.\\
Because every Operating System (without DOS) is taking control after the  bootstrap over the hardware and even FreeBSD.\\
If the kernel is taking  control. Use switches at the loader prompt:  

<code bash>
set hw.ata.ata_dma="0"
</code>

This will load the drive without issue.