You can leave the NTFS format as is on the Win drive as Biab Mac will read it as it doesn't need write access to it.
This is a drive below that I used on the Mac, I renamed the Library to LibraryM then I create a symlink "Library" that points to LibraryM so it works on Win & Mac.
If you have 260gig free that will be enough to have m4a also allowing the drive to work on Win or Mac.
![[Linked Image - Only viewable when logged in]](https://www.pgmusic.com/forums/ubbthreads.php?ubb=download&Number=27250&filename=BB24-Wiv-Drive-LibraryM.png)