It indicates the second chipset is configured in your BIOS in Legacy mode where it is emulating an old IDE controller (IDE devices show as "hda, hdb,etc").
You should change the option in your BIOS to AHCI mode and get it out of legacy mode. Many BIOS have a setting for each of their disk controllers. The Legacy mode is enabled by default on many motherboards to allow them to boot older microsoft operating systems. Win-XP and prior have no SATA drivers, and therefore could not boot windows if the chipset was in SATA mode. This is not an issue with Linux or unRAID.
All that said, either setting will work, and you can change the mode later with no effect or impact on your stored files. It is just that the emulated legacy mode is frequently slower, as it does not take advantage of the features available in modern drives.
Joe L.
I understand, i was already preclearing the disk but i'll set it to ahci after preclearing. Thanks