Skills: none Concepts: the quantity of data as measured in bits or bytes, prefixes for large numbers, abbreviation conventions, data ≠ information This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Data quantity – how much data?

Where does this topic fit? Internet concepts – Applications – Technology – Implications Internet skills – Application development – Content creation – User skills

All data is binary

0 1 The bit – the smallest amount of data

One bit can contain information 1 → Male 0 → Female

PrefixMeans Exact value kilo1024^11,024 mega1024^21,048,576 giga1024^31,073,741,824 tera1024^41,099,511,627,776 PrefixMeans Close enoughDecimal name kilo1000^11,000thousand mega1000^21,000,000million giga1000^31,000,000,000billion tera1000^41,000,000,000,000trillion Numeric prefixes – exact and close enough

Decimal numbers, 10 symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Binary numbers, 2 symbols: 0, 1 Why 1,024?

Binary Decimal ,024 1,000 Round number Funky number

A byte is 8 bits

Abbreviations PrefixBitsBytes KKbKB MMbMB GGbGB TTbTB

Without a calculator … How many bits in 1,400 bytes? Which is more – 1 megabit or 100 KB?

Memory and storage capacity What is the capacity of your computer’s memory? Storage device? Do you know how to find out?

Memory capacity

Storage capacity

How bits can encode information – a punch card example 1 → Hole 0 → No hole So, there are two ones (punched holes) in this card. The card has 12 rows and 80 columns -- how may 0s are there? What is the total storage capacity of a punched card?

Punch cards used a 0/1 code for text See your name in a punch card using the keypunch emulator at kloth.net.kloth.net What is the code for the letter X? Y?

Data ≠ Information

Summary 0 1 How much data?

Self-study questions 1.How many dollars is one megapenny? 2.How many dollars is 1.5 megapennies? 3.We call 8 bits a byte – what do we call 10 pennies? 4.How many eggs in 17 dozen? 5.What is the capacity of your computer’s storage device? 6.What is the capacity of your computer’s memory? 7.How many bits will an 8GB flash drive hold? 8.Which requires more storage – a 1Mb text file or a 1Mb image file? 9.How many bytes in a 27,503 bit file? 10.How many bits in a 27,503 byte file? 11.Which would take longer to transmit across the Internet – a 1Mb text file or a 1Mb image file? 12.At 10 Mb per second, how long will it take to transfer a 20 Mb file across the Internet? 13.At 10 Mb per second, how long will it take to transfer a 20 MB file across the Internet? 14.At 10 Mb per second, how long will it take to transfer a 2 Mb file across the Internet? 15.At 10 Mb per second, how long will it take to transfer a 2 MB file across the Internet? 16.At 10 MB per second, how long will it take to transfer a 20 Mb file across the Internet? 17.At 10 MB per second, how long will it take to transfer a 20 MB file across the Internet? 18.At 10 MB per second, how long will it take to transfer a 2 Mb file across the Internet? 19.At 10 MB per second, how long will it take to transfer a 2 MB file across the Internet? 20.Create a spreadsheet that can convert data quantities (see the calculator on the next slide). 21.Create a spreadsheet to compute data transmission times given transmission speed and file size. 22.You can count and do arithmetic in binary or decimal – what are the advantages and disadvantages of each?

Data quantity conversion calculator: Resource