WD81PURZ 8TB Capacity Problem

Two of wd81purz 8tb disk shows capacity 7tb, usable 6,5tb , is it normal ? Checked other vendors, these disk shows 8tb usable 7,4tb . Can you help me ?

Hi,

You could refer to the following link: https://support-en.wd.com/app/answers/detail/a_id/16656