Hitachi GPT Disk Manager Software is a purpose-built, enterprise-grade tool for safe, efficient GPT disk administration—combining robust repair, alignment, migration, and automation features to keep large-scale storage environments healthy and consistent.

: Primarily targeted at Windows users (such as those on Windows 7) who were using large drives as secondary storage on non-UEFI systems. Related Hitachi Disk Tools

Are you looking to for an older machine, or are you trying to initialize a large modern hard drive on a current operating system? Hitachi Deskstar Desktop Hard Drive - Ask Conrad

You have a hybrid MBR/GPT configuration left over from a dual-boot system. Solution: Use gdisk (Linux) or Partition Wizard to wipe the protective MBR and cleanly rewrite the GPT headers.

If you cannot find or run the Hitachi tool:

One of its primary "features" is its ability to for data storage on Legacy BIOS systems. Core Feature: Virtual Driver Translation