Petabytes
A petabyte is a unit of digital information equal to 1,000 terabytes or one million gigabytes.
A petabyte is a huge amount of digital data. Think of it as a million gigabytes. To put that in perspective, a single high-definition movie might be a few gigabytes. So, a petabyte could hold hundreds of thousands of movies.
In the context of AI, petabytes of data are used to train large language models. This data can include text, images, and code from the internet and other sources. The more data a model is trained on, the more it can learn and the better it can perform tasks.
A petabyte (PB) is a unit of digital information storage equal to 10^15 bytes. It is equivalent to 1,000 terabytes (TB) or 1,000,000 gigabytes (GB). Large AI models, especially those trained on vast internet-scale datasets, require storage and processing capabilities measured in petabytes or even exabytes. Managing and accessing data at this scale is a significant engineering challenge, impacting training times, inference costs, and overall system architecture.
Frontier AI labs are handling increasingly large datasets. OpenAI's use of petabytes for its Habitat storage platform highlights the massive data needs for serving billions of users. The sheer volume of data also raises security concerns, as indicated by the costs associated with reviewing AI agent data access.
- OpenAI says its review into hacks, including on Australian government sites, is costing $500,000 a dayOpenAI · The Guardian AI ·
- Rapidly scaling online storage to serve over 1 billion ChatGPT usersOpenAI · OpenAI News ·
- Inside OpenAI’s in-house data agentOpenAI · OpenAI News ·
- OpenAI ChatGPT
- OpenAI uses petabytes of data for its Habitat storage platform to serve over a billion users and for its internal AI data agent to query vast datasets.
- Gigabyte
- A gigabyte is a unit of digital information equal to 10^9 bytes, much
- Terabyte
- A terabyte is a unit of digital information equal to 10^12 bytes, or 1
The prefix 'peta-' comes from the Greek word 'pente,' meaning five, referring to the power of 10^15. The term 'petabyte' was established by the International Electrotechnical Commission (IEC) as part of the international system of units for digital measurements. Source ↗
Ask an AI chatbot like ChatGPT or Gemini to describe the scale of a petabyte. You can also ask it to compare a petabyte to everyday data sizes like songs or photos to get a better sense of its magnitude.
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Questions people ask
- How much is a petabyte?
- A petabyte is a unit of digital information equal to 1,000 terabytes or one million gigabytes. It's a very large amount of data.
- What is a petabyte used for in AI?
- Petabytes of data are used to train large AI models. This data includes text, images, and code, enabling models to learn and perform complex tasks.
First seen on Subvolts Jan 29, 2026. Updated Oct 10, 2026. Written by an AI model from the items above and reviewed against them weekly; report an error.