1. Bits and Bytes

2. Overview  Bits - A binary decision  Byte - Most common unit of measurement for computer architectures (megabytes, mebibytes, gigabytes, gibibytes, et cetera).

3. Bytes  A group of 8 bits in a computer is called a byte. byte 1 byte: A single character 1 byte: A single character 10 bytes: A single word 10 bytes: A single word 100 bytes: A sentence 100 bytes: A sentence

4. Kilobytes  Kilobyte = 1000 bytes 1 Kilobyte: A page of text 1 Kilobyte: A page of text 10 Kilobytes: The size of a standard web page 10 Kilobytes: The size of a standard web page 100 Kilobytes: A compressed computer image OR a long essay 100 Kilobytes: A compressed computer image OR a long essay

5. What is a megabyte?  1000 kilobytes  First coined in 1970.  Commonly used to mean either 1000 2 bytes or 1024 2 bytes.  Ambiguity addressed on 2007 with standards that require the use of megabyte to describe strictly 1000 2 bytes and "mebibyte" to describe 1024 2 bytes mebibyte

6. One Megabyte  One Megabyte 1024×1024 pixel bitmap image with 256 colors 1024×1024 pixel bitmap image with 256 colorsbitmap 1 minute MP3 compressed music. 1 minute MP3 compressed music.MP3compressedMP3compressed 6 seconds of uncompressed CD audio. 6 seconds of uncompressed CD audio.CD audioCD audio Typical book volume in text format (500 pages × 2000 characters/page). Typical book volume in text format (500 pages × 2000 characters/page). A small novel / 3.5 inch “floppy disk” A small novel / 3.5 inch “floppy disk”

7. More Megabytes  2 Megabytes: A high resolution photograph  5 Megabytes: The complete works of Shakespeare  10 Megabytes: A minute of high-fidelity sound  100 Megabytes: 1 meter of shelved books  500 Megabytes: A CD-ROM

8. Gigabytes  1000 Megabytes 1 Gigabyte: A symphony in high-fidelity sound OR A movie at TV quality 1 Gigabyte: A symphony in high-fidelity sound OR A movie at TV quality 2 Gigabytes: 20 meters of shelved books 2 Gigabytes: 20 meters of shelved books 10 Gigabytes: A good collection of the works of Beethoven 10 Gigabytes: A good collection of the works of Beethoven 20 Gigabytes: A VHS tape used for digital data 20 Gigabytes: A VHS tape used for digital data 50 Gigabytes: A floor of books 50 Gigabytes: A floor of books 100 Gigabytes: A floor of academic journals 100 Gigabytes: A floor of academic journals  Future – Gibibyte (1024 Medibytes)

9. Gigibytes in the news  Comcast announced it will begin limiting downloads for its home broadband customers to 250 GB starting October 1. 250 GB’s are about 100 times what an average user will consume in bandwidth each month. 250 GB’s are about 100 times what an average user will consume in bandwidth each month.

10. Terabytes  1000 Gigabytes/One trillion bytes 1 Terabyte: 50,000 trees made into paper 1 Terabyte: 50,000 trees made into paper 2 Terabytes: An academic research library 2 Terabytes: An academic research library 70 Terabytes: The printed collection of the US Library of Congress in 2007 70 Terabytes: The printed collection of the US Library of Congress in 2007 500 Terabytes – Size of Walmart’s data warehouse in 2005 500 Terabytes – Size of Walmart’s data warehouse in 2005 600 Terabytes – user loaded videos on YouTube in late 2007 600 Terabytes – user loaded videos on YouTube in late 2007  Future - Tebibyte (1024 Gibibytes)

11. Future Measures  Pedibytes / Pebibyte  Exibytes / Exbibyte