Understanding Digital Data Sizes

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Understanding Digital Data Sizes

What do you already know about how computers measure data?

Learning Objective

At the end of the lesson you will be able to explain different digital data sizes, from bits to geopbytes, and give examples of what can be stored in each.

What is a Bit?

A bit is the smallest unit of data. It stores a single binary value: 0 or 1. Used for on/off or true/false signals.

What is a Byte?

A byte is 8 bits. It can store a single character, such as a letter or a number, or small data.

From Kilobytes to Megabytes

1 Kilobyte (KB)

1024 KB (about 1 million bytes). Can store a minute of audio or a high-quality image.

1 Megabyte (MB)

1024 bytes. Can hold a short text file or a small low-resolution image.

Larger Data Units

1 Terabyte (TB)

1024 MB (about 1 billion bytes). Can hold several songs or a short HD video.

1024 GB (about 1 trillion bytes). Large enough for 500 SD movies or massive projects.

1 Gigabyte (GB)

Beyond Terabytes

Yottabyte, Brontobyte, Geopbyte

Sizes above ZB. YB: global surveillance. Brontobyte/Geopbyte: ideas for future or advanced storage.

1 PB = 1024 TB. 1 EB = 1024 PB. 1 ZB = 1024 EB. Used for huge data sets, like streaming libraries or internet archives.

Petabyte, Exabyte, Zettabyte

Why Do Data Sizes Matter?

Knowing data sizes helps with choosing storage, sharing files, and understanding technology limits.

Quick Check

Can you match each data size to what it can store? For example: What would you use a gigabyte for?

Write down 3 things you learned in this lesson.

Write down 2 things you want to know more about.

Ask 1 question about something you haven't quite understood yet.