
Ext 1-2-3-4 are all read and writeable by the majority of Linux operating systems, FAT32-ExFAT-NTFS-ReFHS are all read and writeable by most Microsoft Windows operating systems.

If there is data on the drive but your Mac device cannot read it even after attempting to manually mount the drive partitions, then I recommend plugging the drive into a computer with support for the file system being used on those partitions. I recommend you try mounting any partitions first.


With the limited information you have presented, formatting drives with Mac OS 10.0 (2001) to the newest version 10.13 (Dec 2017) has always been the same.
