What format is Xbox One external hard drive?

"The Xbox One console is only compatible with external drives that use the NT File System (NTFS), which most modern external hard drives use. Any external drive that uses the older FAT32 file system will have to be reformatted into NTFS, which will erase any data on it. Microsoft has also ensured that drives formatted for the Xbox One are not accessible via PC." source: https://gigmocha.com/what-format-is-xbox-one-external-hard-drive/