Multiple users reported stability problems when using the drive beyond the 2TB capacity. One user experienced severe system lag and hard drive freezing after filling the drive past 2TB, eventually leading to data loss.

: MBR supports only 4 primary partitions; GPT supports up to 128 primary partitions in Windows.

: Unlocks the unallocated, hidden space on high-capacity drives under restrictive OS environments.

For modern high-capacity drives, the traditional MBR partitioning scheme is "legacy" and significantly limited:

: MBR is capped at 2.2TB, whereas GPT can theoretically handle up to 9.4 Zettabytes.

The software was not a generic tool built by Hitachi from scratch. It was a specially-branded version of a more powerful tool from .

For modern HGST/WD drives, use the for diagnostics. Troubleshooting Hitachi GPT Disks