Split mass storage HDD between MacOS and Windows

[NihalGW]

I have my machine dualbooted on separate SSD's (both 250gb) & I just bought a 2tb hdd for mass storage. While i am okay with just adding it to windows (i need a place for my steam library); i would love to partition it such that i can have some extra space on MacOS too.

I DO NOT need the files on one partition to be accessed by the other's OS. How can i go about doing this? If i have unallocated space after partitioning in one OS, will it show up in the other? or is there something more nuanced i have to do? Thanks in advance for any help

 

[BreBo]

I DO NOT need the files on one partition to be accessed by the other's OS. How can i go about doing this? If i have unallocated space after partitioning in one OS, will it show up in the other? or is there something more nuanced i have to do? Thanks in advance for any help

You can use the disk formatting and partitioning from Guide: MultiBooting UEFI