both .06 and .67 bios contain LBA-48 for drives up to 2.2tb
the .06 puts it all on F, but the FATx file system doesnt seem to like partitions over 256gb, so if you put a 300 or 320gb drive all on F you will start to see alot of corruption as it fills up, which is why i say use .06 up to 250gb and .67 for anything larger <