GCSE Computing Revision – Data Sizes

The data sizes:

  • A bit is a single binary digit
  • A nibble is half a byte (four bits)
  • A byte is 8 bits
  • A kilobyte is 1024 bytes
  • A megabyte is 1024 kilobytes
  • A gigabyte is 1024 megabytes
  • A terrabyte is 1024 gigabytes
  • (According to Wikipedia, it then goes Petabyte, Exobyte, Zettabyte, Yottabyte)
  • 1024 times bigger each time

1024 is the magic number

  • You’d think a kilobyte would be 1000 bytes, like how a kilogram is 1000 grams
  • But it’s computers we’re talking about, here. They like binary.
  • Remember in the converting binary post, the numbers doubled each time? 1024 is double 512, which is double 256, which is double 128, which is double 64, etc.
  • 1024 is the closest power of 2 to 1000 so it is used instead of 1000
  • REMEMBER: 1024

All hail 1024!


About Matt

I like writing, filmmaking, programming and gaming, and prefer creating media to consuming it. On the topic of consumption, I'm also a big fan of eating.
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4 Responses to GCSE Computing Revision – Data Sizes

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