The easiest way to format the disc is by using macOS built-in Disk Utility app, but problems are very possible. So the only workaround is to format the disc to HFS+ or APFS. macOS can read but not write to NTFS formatted drives. But most drives (from any manufacturer) come formatted in the NTFS file system format for OS Windows, while for macOS we needed the HFS+ format or the Apple’s brand new APFS (Apple File System) format. A Transcend company says that it can be used on both Windows and macOS. I bought a brand new external hard drive (disk) Transcend StoreJet 25M3 1Tb.