Hi, One of my clients has a mixed Linux/Mac OS/Windows environment in his office. He just purchased a 4 TB external hard disk, which he intends to use on his various workstations. Up until recently, I've been using plain old MBR/FAT for hard disks in mixed environments. Fire up fdisk, make one big 0b type partition, and then format it using mkdosfs. Unfortunately, there's a 2 TB limit to that. Of course, I could still use a GPT partition, but then I'd still have to format it using a "common denominator" filesystem, e. g. FAT... which is also limited to 2 TB as far as I know. So what now? Use Windows 10 to format the disk using NTFS? This, Windows and Linux could use it, and I'd have to check if Mac OS can manage NTFS file systems. A few years ago, it didn't. Any suggestions? Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Mail : info at microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12