Cedric Crawley wants to keep Windows 7 and his applications in one partition, and his data in another. Creating a separate data partition protects both your system and your data.

Then create partitions - if drive is larger than 2TB you might need gdisk instead of fdisk. and format using mkfs.ext4 or ext3 or xfs (see which mkfs commands are on LibreElec.

Basic Disk vs Dynamic Disk. Post shows how to convert basic disk to dynamic disk OR dynamic disk to basic disk using UI, Diskpart, CMD without losing data.