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Data storage and compression
Recognize the units used to measure data storage, including bit, nibble, byte, kibibyte (KiB), mebibyte (MiB), gibibyte (GiB), tebibyte (TiB), pebibyte (PiB), and exbibyte (EiB), along with the number of smaller units contained in each, such as 8 bits in a byte and 1024 mebibytes in a gibibyte.
4
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40
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28
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90 min
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CambridgeIGCSEComputer ScienceData representation
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Data storage and compression outcomes4 objectives
- Recognize the units used to measure data storage, including bit, nibble, byte, kibibyte (KiB), mebibyte (MiB), gibibyte (GiB), tebibyte (TiB), pebibyte (PiB), and exbibyte (EiB), along with the number of smaller units contained in each, such as 8 bits in a byte and 1024 mebibytes in a gibibyte.
- Determine the file size of an image and a sound file based on provided information, ensuring calculations are done using 1024 as the base unit rather than 1000, and include factors like image resolution, color depth, sound sample rate, and track length. Recognize that compression is used to decrease file size.
- Comprehend the reasons for and benefits of data compression, including its effects such as reduced bandwidth usage, decreased storage requirements, and shorter transmission times.
- Learn how files can be compressed using both lossy and lossless methods, where lossy compression permanently removes data (e.g., lowering resolution or sample rate) and lossless compression reduces file size without losing any data (e.g., through run-length encoding).
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