"Packet Mode" for DragonFlyBSD

What is "Packet Mode" when installing DragonFlyBSD?

Packet mode makes use of BIOS INT 0x13 extensions to handle disk I/O, which is default on modern BIOSes

JuvenalUrbino My BIOS is a Gigyabyte BIOS from 2008, should I use this mode?

Jay What if I already have GRUB installed and I don't wish to use bootlocks, then should I still have Packet Mode enabled?

Jay It doesn't mention anything to do with "Packet Mode" though :/