My colleague wanted to by a high capacity external drive for a user and asked me if there were any compatibility issues. I looked up Google and found that there were several limitations,
- On Windows, booting from 3TB drive requires UEFI bios as well as 64-bit Vista or higher. Disk has to be formatted in GPT.
- As auxiliary drive, still need to format in GPT to make a 3TB volume, MBR supports up to 2.2TB per volume only.
- You can have a 3TB volume in a USB box as the SATA-to-USB bridge chip inside the enclosure takes care of any addressing issues. Though, not all enclosures support 3TB disk.