Hard Drive Divinity (HDD) is the ability of a CPU to transform and access their full power through the utilization of their installed Processor Units.
Usually, there are some changes within a CPU when transformed into their HDD form. These include their personality and appearance. Noticeable features that change within a CPU's appearance include their eyes, hair color, and hair style. In some cases, their stature and figure may change.
Gameplay wise, a CPU's stats increases significantly when in HDD form. The Processor Units' stats stack with the CPU's stats in human form.
Hyperdimension Neptunia
In Hyperdimension Neptunia, a CPU may access their HDD form once they utilize a combo that ends in "HDD." The player can then choose if he/she wants the CPU character to transform. Once transformed, the CPU retains the ability to stay in HDD form for an indefinite amount of time unless if the player chooses to revert the character back to human form or if the battle ends.
Hyperdimension Neptunia mk2
In Hyperdimension Neptunia mk2, a CPU can transform to HDD form once the character has 100 SP to expend. The transformed CPU will consume 15 SP per turn in order to maintain HDD form. If the CPU has insufficient SP, is inflicted with the Virus status ailment, or hits 0 HP, the character will revert back to human form.
Hyperdimension Neptunia Victory
In Hyperdimension Neptunia Victory, a CPU can transform to HDD form if the character has at least 20% of the total SP to expend. The character can remain in HDD form for an indefinite time without expending on extra SP in order to maintain the form. If the CPU is inflicted with the Virus status ailment or hits 0 HP, the character will revert back to human form.
Trivia
- The localized English version of the game sometimes refers to HDD as HDD Form. This is incorrect due to HDD being the activation method to go into their goddess forms (CPU Forms in English) and not the form itself.
- Also HDD (Hard Drive Divinty) is also only used in the English version. In Japanese usually only "Henshin" (Transform[ation]) or "Megami-ka" (a mix of Megami (Goddess) and "Shinka" (Evolution).