Considering The Elder Scrolls Online: Tamriel Unlimited is likely to consume nearly your entire life, it seems only fair that it should consume nearly your entire hard drive. The Pre-Load went live for the MMORPG today on Xbox One and the download size for the game was revealed to be a whopping 54.69 GB:

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Meanwhile, the PlayStation Store is pegging the game for at least 60 GB:

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So no matter what console it's played on, it will be a big HDD commitment indeed.