The bios already on Bank 0 is a .67 bios which means it supports F + G drive. If you are fitting a 300gb you need to have the drive split because the single partition will be greater than 250 GB which means data corruption becomes a problem, unless you use XBPartitioner and format with 32k clusters.
Format for a G as well as F or customise X24981 to have a large partition 6 (F) but remember to format the way stated.