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Hard Drives

Hard Drives

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Hard Drives

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Presentation Transcript

  1. Hard Drives • Ryan 2005

  2. What it Does • Stores info magnetically • hard “platter” holds info

  3. must fast forward or rewind to reach specific point can reach info magnetically Cassette Tape vs.Hard Drive

  4. Performance • Data is stored in files • Most hold 10-40 gigabytes • most can deliver 5-40 bytes per second to CPU

  5. Inside It • Sealed aluminum box • underneath board-connections for motor that spins platters • platters hold info • arm holds read/write heads

  6. Tracks and Sectors • track is a concentric circle on a platter • sector is pie-shaped wedge on track

  7. How it Stores Data • Magnetically

  8. Platters • Hold info

  9. Arms • Hold read/write heads • glide over platters and retrieve/change info

  10. “Deleted” Info • Hard drive like book: info stored on “pages” and “index” • when info deleted, “index” erased of info, but is still on page

  11. More about Deleted Data • People can still get info off of computer after deleted unless wiping software is used and drive destroyed

  12. Misc. Info • Hard drives invented in 1950s • lots of units of measurement for drive • bit: unit of 0 or 1 • byte: 8 bits • gigabyte: 1,000,000,000 bytes • yottabyte: 1024 bytes

  13. About the Author • I am Ryan Minster, and I enjoy playing with Rubik’s Cubes and card games, such as Spades and Poker.

  14. Bibliography • “Computer Hardware.” Apr 28 2005 <http://www.computerhope.com/help/hdd.htm> • How Stuff Works “How Hard Disks Work.” Brain, Marshall. 25 Apr 2005. <http://www.computer.howstuffworks.com/harddisk.htm> • “Skeletons on your hard drive.” News.com. 3 May 2005. <http://news.com.com/Skeletons+on+your+hard+drive/21001029_676995.html>