Windows and MacOS are very fastidious about the kind of disk they can open and it is really annoying when you have to copy a file to a colleague and the system refuse to open the disk.

Matthew analyzed the situation.

Here is a recap; to have a disk that can easily be open by Windows, MacOS, and Linux use:

• a GPT partition table with one partition of type 0700 (Microsoft basic data)
• the exFAT filesystem

Before starting clear up the disk using wipefs -a /dev/sdZ. Then the partition table can be made with gdisk and one can format with mkfs.exfat.