Fantec QB-35US3-6G - How to create spanned drive under Windows 7???

    Fantec QB-35US3-6G - How to create spanned drive under Windows 7???

    I have a Fantec QB-35US3-6G with 2 HDD of 500Gb. How can I create spanned drive under Windows 7???
    I can create a spanned volume under "Computer Management", but it will give a notification: "The operation you selected will convert the selected basic disk(s) to dynamic disk(s). If you convert the disk(s) to dynamic, you will not be able to start installed operating systems from any volume to the disk(s) (except the current boot volume). Are you sure you want to continue?". When I press "Yes", the get the error message: "The operation is not supported by the object."

    Any fix for this? i.e. firmware upgrade? Migrating to W10? Additional driver software?