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Hard Drives

Hard Drives. Ryan 2005. What it Does. Stores info magnetically hard “platter” holds info. must fast forward or rewind to reach specific point. can reach info magnetically. Cassette Tape vs. Hard Drive. Performance. Data is stored in files Most hold 10-40 gigabytes

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Hard Drives

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  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>

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