Every day, the world creates an almost unimaginable amount of information — photos, videos, sensor readings, financial transactions, and AI training data all add up fast. Just a decade ago, gigabytes felt like plenty of storage. Now, entire industries measure their data in far bigger units. That’s where the petabyte comes in.
A petabyte is one of the largest storage units used in modern computing, and it has become the standard measurement for cloud providers, AI companies, streaming platforms, and research labs handling massive datasets. As storage needs have exploded, terms like MB and GB simply aren’t enough anymore.
In this guide, you’ll learn exactly what a petabyte is, how big it really is, how it compares to a terabyte, real-world examples of petabyte-scale storage, and what it costs to store that much data.
What Is a Petabyte?
A petabyte (PB) is a unit of digital storage equal to 1,024 terabytes in binary measurement, or 1,000 terabytes in decimal measurement. It sits between the terabyte (TB) and the exabyte (EB) on the data measurement scale.
Storage units exist because raw byte counts become unreadable once numbers get too large. Fifteen zeros in any number is not something anyone wants to have to write out on each description of a data center’s capacity. Thus, engineers came up with the convention of sharing bytes into KB, MB, GB, TB, and even PB, to maintain the numbers more manageable and meaningful.
The difference between binary and decimal measurement is important:
- Binary (used by operating systems): 1 PB = 1,024 TB
- Decimal (used by storage manufacturers): 1 PB = 1,000 TB
That’s why the amount of space listed in the operating system might be slightly different when a hard drive is marked “1 TB” — the manufacturer is using decimal math, whereas your operating system is using binary math.
A petabyte is intended for organizations, rather than individuals, when compared to a gigabyte or terabyte. While personal devices generally don’t need more than a few terabytes, businesses with users around the world, video collections, or AI models often operate in petabytes.
How Big Is a Petabyte?
Numbers are meaningless without a point of comparison! Well, in real-life terms, here’s what a petabyte is.
- Photos: A single petabyte can hold roughly 200 million photos taken on an average smartphone.
- Videos: It has the capacity to hold several hundred thousand hours of streaming video.
- Documents: You could fit millions of filing cabinets’ worth of paper documents, digitized, into one petabyte.
- Emails: Hundreds of millions of emails, with attachments.
- Smartphones: If an average phone holds 128 GB, you’d need roughly 8,000 smartphones to match one petabyte.
- Laptops: With a typical 512 GB laptop drive, it would take around 2,000 laptops to reach 1 PB.
These comparisons are not exact; they fluctuate based on file size, resolution, and compression, but they do provide a sense of scale. You don’t accidentally end up with a petabyte. It’s a lot of data that is typically part of an organization, not one person, and which requires a coordinated infrastructure, not a single device, to manage it properly.
Petabyte Size Explained with Real-World Examples
It’s easy to understand a petabyte in theory. When you see how real companies are using the petabyte scale, the concept is easy to understand.
Enterprise Data Centers: Large enterprises with worldwide operations may be responsible for storing several petabytes of information on their servers, from customer records to transaction logs to internal analytics.
AI Training Models: Modern AI systems rely on vast amounts of data, often in the order of petabytes of text, images, audio, and video. The bigger the amount of data a model is based on, the more storage and computing power it requires.
Cloud Storage Providers: Providers like AWS, Google Cloud, and Microsoft Azure operate data centers holding exabytes of storage, built from thousands of individual petabyte-scale storage clusters.
Netflix & Streaming Platforms: Streaming platforms store their entire content libraries — original series, licensed movies, and multiple video-quality versions of each title — across petabytes of storage, distributed globally for fast playback.
Scientific Research: In fields such as genomics, particle physics, and climate science, the amount of data generated is enormous. The number of petabytes is generated by a single research project, for example, the analysis of satellite images or genome sequencing.
Financial Institutions: Banks and trading platforms store years of transaction histories, fraud-detection logs, and compliance records, often totaling multiple petabytes to meet regulatory retention requirements.
Large E-commerce Companies: Product catalogs, customer behavior data, images, reviews, and order histories grow rapidly with scale, taking large eCommerce companies far into petabyte land.
In each of these industries, the same point is true: when data crosses into millions of users or millions of transactions, petabyte storage becomes a necessity.
Data Measurement Hierarchy
To understand where a petabyte fits, it helps to see the entire data measurement scale side by side.
| Unit | Abbreviation | Equivalent Size |
|---|---|---|
| Byte | B | 1 Byte |
| Kilobyte | KB | 1,024 Bytes |
| Megabyte | MB | 1,024 KB |
| Gigabyte | GB | 1,024 MB |
| Terabyte | TB | 1,024 GB |
| Petabyte | PB | 1,024 TB |
| Exabyte | EB | 1,024 PB |
| Zettabyte | ZB | 1,024 EB |
| Yottabyte | YB | 1,024 ZB |
The units increase by a factor of approximately 1,000 on the steps up the ladder. The internet and cloud require a lot more: a petabyte is in the middle of this spectrum, large enough for enterprises but still far too small for the internet and cloud.
But what comes after petabyte? The next level up is an exabyte, followed by a zettabyte and yottabyte. These are not numbers for storage of specific organizations or companies, but rather the numbers of bits of data stored in the world: Today, the amount of data stored in the world is measured in the zettabyte range, and it is quickly approaching the yottabyte range as more data is created each year from AI and IoT devices.
How Many Terabytes Are in a Petabyte?
One of the most frequently asked questions is this, and it’s dependent on the measurement system, binary or decimal.
Binary conversion is used by operating systems and IT: 1 PB = 1,024 TB
Decimal conversion (used by storage manufacturers and marketing materials): 1 PB = 1,000 TB
For quick reference, here’s a table that shows how to convert terabyte to petabyte.
| TB | PB |
|---|---|
| 1,000 TB | 1 PB (decimal) |
| 1,024 TB | 1 PB (binary) |
| 5,000 TB | 5 PB |
| 10,000 TB | 10 PB |
| 100,000 TB | 100 PB |
Terabyte → Petabyte: Divide the terabyte figure by 1,024 (binary) or 1,000 (decimal) to get petabytes.
Petabyte → Terabyte: Multiply the petabyte figure by 1,024 (binary) or 1,000 (decimal) to get terabytes.
The 1,000 TB figure is adequate for most business and everyday communication needs. However, when it comes to real server capacity or IT infrastructure, stick with the binary figure — how many terabytes in a petabyte matters more when it comes to planning real servers.
Petabyte vs Terabyte
| Feature | Terabyte (TB) | Petabyte (PB) |
|---|---|---|
| Storage Capacity | 1,024 GB | 1,024 TB |
| Typical Users | Individuals, small businesses | Enterprises, cloud providers, research labs |
| Cost | Relatively low, consumer-friendly | High, requires enterprise infrastructure |
| Performance | Single drive or small array | Distributed storage systems, clusters |
| Enterprise Usage | Department-level storage, backups | Company-wide data centers, AI training, big data |
| Personal Usage | External drives, laptops, phones | Rarely applicable to individuals |
Most people already have a terabyte — it’s a standard size for most laptops, external hard drives and even some smartphones. A petabyte, however, is not something you can purchase off the shelf. It demands arrays of servers, redundant storage systems and special infrastructure teams to manage.
There are other big differences when it comes to cost. The cost of a terabyte might be very low to a consumer, and petabyte-scale infrastructure requires continuous investments in hardware, networking, redundancy, and maintenance.
So, when to use TB storage and when is it time for PB storage? For personal files, small businesses, or a few devices, terabytes are sufficient. However, as your data grows to millions of users, years of transactions, or significant AI model training, the need for petabyte infrastructure becomes more pressing.
Common Uses of Petabyte Storage
Big Data Analytics
Petabyte storage is required for storing the raw data before and after processing, and while companies analyze customer behavior, market trends, or operational data, they need to store this information at scale.
Artificial Intelligence
Large language models and computer vision systems are among the AI models that are trained on petabytes of text, images, and video. The more training data that’s available, the better the model will perform, raising storage needs further.
Cloud Storage & Backup
Cloud platforms expose millions of users at a time, where they upload photos, documents, and files. Scale that up to a worldwide population of users, and petabyte-level backup systems become a requirement instead of a nice add-on.
Video Streaming
Every show, movie, and video uploaded to a streaming platform is available in multiple resolutions and formats to support viewing on various devices and internet speeds. That can quickly take storage requirements into petabytes.
Medical Research
Medical imaging, like an MRI or CT scan, generates very high-resolution files, as do pathology slides. Petabytes rapidly build up at hospitals and research institutions that are storing years of patient imaging data.
Scientific Research
Companies such as telescope manufacturers, particle accelerators, and climate monitoring devices produce streams of raw data. In a few years, a single astronomical survey can generate several petabytes.
Financial Services
For regulatory reasons, banks have to keep records of transactions, trails, and fraud detection records, often for many years. By itself, this retention requirement can drive storage requirements to petabytes.
Enterprise Backup
Backups are made on a continuous basis with large organizations supporting the servers, databases, applications, and employee files. Backup systems, used alone, can take up petabytes of storage space, with version history and disaster recovery copies.
Large E-commerce Platforms
Product images, customer reviews, order histories, and behavioral tracking data accumulate rapidly at scale. Major e-commerce companies manage petabytes of storage just to keep their platforms running smoothly.
Each of these industries shares one thing in common: as the volume of data grows, so does the need for storage that scales well beyond what a single server or drive could ever handle.
Can You Buy a 1 Petabyte Hard Drive?
No — at least not as a single physical device. Consumer and even most enterprise hard drives max out well below a petabyte, typically in the tens-of-terabytes range. Reaching 1 petabyte hard drive capacity requires combining multiple storage devices, not relying on one.
Organizations achieve petabyte-scale storage through:
- Storage Arrays — A collection of several drives that appear to be a single drive.
- NAS (Network Attached Storage) — centralized storage accessible across a network
- SAN (Storage Area Network) —enterprise-class high-speed dedicated storage networks.
- Object Storage —scalable storage systems designed for unstructured data, typical in cloud platforms.
- RAID configurations — combining drives for both redundancy and performance.
- Enterprise SSDs — performance-critical systems: high-speed flash storage.
- HDD Clusters — big packs of hard drives cooperating to provide bulk storage.
In short, petabyte storage isn’t a product you purchase — it’s an infrastructure you build.
How Much Does Petabyte Storage Cost?
The cost of petabyte-scale storage isn’t a one-size-fits-all proposition, as it’s subject to a fair amount of variance based on the method of constructing and maintaining the storage.
Several factors influence the total cost:
- HDD vs SSD: Hard drives are cheaper per terabyte, while SSDs cost more but deliver faster performance.
- Cloud vs on-premises: Cloud storage shifts costs to ongoing subscription fees, while on-premises infrastructure requires upfront hardware investment.
- Infrastructure: Servers, racks, cooling systems, and power all add to the total cost of ownership.
- Networking: High-speed connections are needed to move petabyte-scale data efficiently.
- Redundancy: Backup copies and failover systems increase storage requirements — and cost — beyond the raw data size.
- Maintenance: Ongoing monitoring, upgrades, and IT staffing add long-term expense.
- Scalability: Systems designed to grow smoothly often cost more upfront but save money as storage needs increase.
It’s more likely to be a range of storage prices than a specific and unchanging figure and depends on performance, redundancy, infrastructure (cloud vs on-premises), and other factors. The majority of organizations have storage vendors or cloud-based storage providers to obtain an accurate, up-to-date pricing model for their storage needs.
Enterprise Storage Requirements
But storing a petabyte of data is not simply about capacity; it’s about creating infrastructure that can reliably meet the demands of the real world.
Scalability matters most. Enterprise storage needs must scale up but not significantly, because data doesn’t necessarily shrink over time.
High availability ensures systems stay accessible even during hardware failures or maintenance windows — critical for businesses that can’t afford downtime.
Disaster recovery: planning helps to prevent data loss due to outages, natural disasters, or malicious activity, and generally relies on geographically distributed backup copies.
Backup, separate from disaster recovery, provides regular snapshots that let organizations restore data to a specific point in time.
Security is non-negotiable at this scale. Petabyte-level storage often holds sensitive customer, financial, or medical data, requiring encryption, access controls, and continuous monitoring.
RAID spreads data over more than one drive; this way, the risk of losing data from a single point is reduced, and read/write performance is increased.
Performance: Data used for AI training must be stored at high volume, whereas data used for archival requires cost efficiency over data transfer speed.
Hybrid cloud approaches let organizations combine on-premises infrastructure with cloud storage, balancing cost, control, and flexibility.
In combination, these needs are a clear argument for what petabyte storage is: a strategic infrastructure decision, rather than a capacity target..
Answer to the Most Common Questions
Is 1 PB Equal to 1024 TB?
Yes, 1 petabyte is equal to 1,024 terabytes in binary measurement. Storage manufacturers, however, tend to use decimal measures with 1 PB = 1,000 TB. The binary standard is more precise for IT and technical applications, and the decimal standard is used in marketing and product labels.
How Much is 1 Petabyte?
One petabyte is about a 1024 terabytes or 1,000,000 gigabytes. That’s enough to store, for perspective, over 200 million high-resolution photos from smartphones, which isn’t nearly enough for any one device.
How Many GB is a Petabyte?
A petabyte is equal to about 1,048,576 gigabytes in binary measurement, or 1,000,000 gigabytes in decimal measurement. That’s why petabyte-scale storage is reserved for enterprises, cloud providers, and large-scale data operations rather than personal devices.
What is PB vs TB?
A terabyte (TB) is a common unit for personal and small-business storage, while a petabyte (PB) equals 1,024 terabytes and is used for enterprise-scale data. TB fits laptops and external drives; PB fits data centers, AI training, and cloud infrastructure.
What Comes After Petabyte?
After the petabyte, the next unit is the exabyte (EB), followed by the zettabyte (ZB) and yottabyte (YB). Each unit represents roughly 1,024 times the size of the one before it, reflecting the accelerating scale of global data creation.
Can You Buy a 1 Petabyte Hard Drive?
There is no hard drive available that is 1 Petabyte in size. Instead, organizations have to rely on distributed infrastructure to achieve petabyte-scale capacity by clustering several drives together through storage array products, RAID, NAS, or SAN.
How Much Data Can a Petabyte Hold?
A petabyte can store approximately 200 million photos, hundreds of thousands of hours of video, or years of enterprise transaction records. That is a lot of data for millions of users, although it depends on the type of file and compression.
Conclusion
One petabyte is one of the largest practical units of digital storage available today, and it contains 1024 terabytes, or hundreds of millions of files. In an era where AI, cloud computing, and the generation of data on an unprecedented scale are rapidly gaining ground, enterprises have become more familiar with the infrastructure of the petabyte scale.
To grasp the technology driving today’s data centers, it’s helpful to know that 1,024 terabytes equal one petabyte (or 1,000 TB using decimal measurement), what factors contribute to the cost, and how organizations reach this level of storage. With data volumes only increasing, it’s easy to imagine a future when petabytes feel as ordinary as gigabytes do today.