If it is larger than 32GB, you can only format it to exFAT. If you want to format your WD My Passport to FAT32, you must make sure that the size is smaller than 32GB. It does not offer the ability to format a drive larger than 32GB to FAT32, the only available choices are NTFS or exFAT.
Follow the details below to convert WD My Passport to format WD Passport for Mac.