Toshiba hard drive showing up as UDMA5 not 6 why?

NickyB

Distinguished
Nov 14, 2008
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I installed a Toshiba platter drive in my asrock z170 extreme4 motherboard. I formatted it as guid. I have the intel rst drivers installed and it is showing at sata 6gb transfer rate with ncq working. But in my motherboards bios, it is showing up as udma5 NOT udma6. Why isn't is using the latest udma6 transfer speed? Is there something wrong with the drive being recognized in the bios? It is a 7200rpm drive and the model of the drive is a toshiba hdwe140 4tb with firmware FP2A.