Therefore, if you want to use a NTFS formatted external drive on your Mac, you might want to change the format to FAT32, because it is a file system that is compatible with all types of computers (Windows, Mac or Linux-based).
Normally, hard drives used on Windows-based systems are formatted using the NTFS file system and, while Mac computers can read and copy data from this type of hard drive, they can't write it on them. Nowadays, external hard drives are a common solution for storing and transferring large amounts of data from one computer to another. But, if you want to use an external hard drive on your Mac that was mainly used on a Windows computer, you might encounter a problem. How to Convert External Hard Drive to FAT32 on Mac OS X for Free Using Disk Utility