Question 1

What is the difference between bits and bytes?

Accepted Answer

A bit (b) is the smallest unit of digital information, representing a single binary value of 0 or 1. A byte (B) consists of 8 bits and is the standard unit for measuring file sizes and memory. Internet speeds are typically measured in bits per second (Mbps), while file sizes are measured in bytes (MB, GB).

Question 2

Why does 1 KB equal 1,024 bytes instead of 1,000?

Accepted Answer

In computing, storage sizes use binary (base-2) prefixes because computers operate in binary. 1 KB (kilobyte) = 1,024 bytes (2^10). This is the standard convention used by operating systems like Windows and macOS when displaying file sizes. Some manufacturers use decimal (base-10) where 1 KB = 1,000 bytes for marketing hard drive capacities, which is why a 1 TB drive often shows less available space on your computer.

Question 3

How much storage do I need for common file types?

Accepted Answer

A typical text document is a few KB, a high-resolution photo is 2-10 MB, a 3-minute MP3 song is about 3-5 MB, a standard-definition movie is 1-2 GB, and a 4K movie can be 20-50 GB. A 1 TB hard drive can store roughly 250,000 photos, 250 hours of HD video, or 200,000 songs.

Question 4

What is a petabyte and how big is it?

Accepted Answer

A petabyte (PB) is 1,024 terabytes or approximately 1 million gigabytes. It is an enormous amount of data—equivalent to about 20 million four-drawer filing cabinets filled with text, or roughly 13.3 years of HD video. Large data centers and cloud storage providers measure their total capacity in petabytes or even exabytes (1,024 petabytes).

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