Computer Studies·Data storage · NSSCO 4.2
File formats, data integrity checks & compression (lossy/lossless)
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Every file on a computer is stored in a particular format, from MP3 music to PDF documents. In this lesson we group the formats you must know, learn how a computer checks that data arrived without mistakes, and see how files are squeezed smaller using lossy and lossless compression.
What you'll learn in this lesson
By the end you should be able to (NSSCO Computer Studies 4.2):
- Identify a variety of formats for the storage of audio, video, graphics and alpha-numeric data, such as: MIDI, JPEG, Bitmap, GIF, MP3 and MP4, PDF, AVI, WAV, WMA and WMV, txt, RTF, HTML, ZIP
- Discuss the verification and correction of data integrity after data transfer processes, e.g. parity checks, check sums, check digits, Automatic Repeat reQuests (ARQ)
- Explain how data in different formats (audio, video, graphics and text) can be compressed using lossy or lossless compression
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