Data: Unit 14 : Data storage and compression Flashcards
What is a nibble?
4 bits or half a byte
What is decimal prefix?
multiples a unit by powers of 10.
What is a binary prefix?
multiples a unit by powers of 2
How is “kilo” defined in a decimal prefix?
binary prefix?
decimal prefix : 10 ^3
binary prefix: 2 ^10
How much bytes does a kilobyte have in a decimal prefix?(size)
megabyte?
gigabyte?
terabyte?
kilobyte= 1000bytes
megabyte = 1000kilobytes
gigabyte =1000megabytes
terabyte = 1000gigabyte
How much bytes does a kilobyte have in a decimal prefix?(magnitude)
megabyte?
gigabyte?
terabyte?
kilobyte= 10^3bytes
megabyte = 10^6 kilobytes
gigabyte =10^ 9 megabytes
terabyte = 10^ 12 gigabyte
How much bytes does a kilobyte have in a binary prefix?(size)
megabyte?
gigabyte?
terabyte?
kilobyte= 1024bytes
megabyte = 1024kilobytes
gigabyte =1024megabytes
terabyte = 1024gigabyte
How much bytes does a kilobyte have in a binary prefix?(magnitude)
megabyte?
gigabyte?
terabyte?
kilobyte= 2^10 bytes
megabyte = 2^20 kilobytes
gigabyte = 2^30 megabytes
terabyte = 2^40 gigabyte
What is compression?
changing the format of a data file so that the size of the file becomes smaller
What is bandwidth?
the amount of data that can be carried on a network in a given period.
What are the two types of compression algorithms?
- Lossless compression
- Lossy compression
What is lossless compression?
Lossless compression is compressing a file in such a way that it can be decompressed without any loss of data.
What is lossy compression?
- Compression where some of the data is removed; the original file cannot be restored when the lossy file is decompressed,
What is petabyte?
1 petabyte is 1000 terabytes or 1 million gigabytes.
What is RLE(run-length-encoding)?
Run length encoding is used to reduce the size of a repeating string of items.
