Short Answer 
The answer explains file size measurements in various units, such as bytes, kilobytes, megabytes, gigabytes, and terabytes. It also provides specific examples of the sizes of different file types (MPEG-4 video, MP3 audio, and text document), concluding that the sizes are consistent with their formats and expected data sizes.
Step 1: Understand File Size Measurements
File sizes are measured in specific units, each representing different amounts of data. The most common units include:
- Byte (o): The smallest unit of measurement, equal to 8 bits.
- Kilobyte (Ko): 1024 bytes, roughly equal to 1000 bytes.
- Megabyte (Mo): 1024 kilobytes, approximately 1 million bytes.
- Gigabyte (Go): 1024 megabytes, about 1 billion bytes.
- Terabyte (To): 1024 gigabytes, or roughly 1 trillion bytes.
Step 2: Analyze the Sizes of Different Files
The excerpt provides sizes for three types of files, displaying how each size correlates with its format:
- Video MPEG-4: 2,1 Go, which translates to 2,147,483,648 bytes.
- Audio MP3: 2,2 Mo, equal to 2,252,800 bytes.
- Document texte brut: 4,2 Ko, corresponding to 4,168 bytes.
Step 3: Conclusion on File Size Consistency
The provided sizes gauge the respective data types effectively, signifying logical consistency for their formats and durations. The sizes calculated are rounded to the nearest decimal:
- The MPEG-4 video file is valid at 2,1 Go for its size and format.
- The MP3 audio size at 2,2 Mo fits perfectly with its length of 2 minutes and 30 seconds.
- The text document measures 4,2 Ko, appropriate for 4,168 characters.