1. Hard Drives Ryan2005

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

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

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: 10 24 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 How Stuff Works “How Hard Disks Work.” Brain, Marshall. 25 Apr 2005. “Skeletons on your hard drive.” News.com. 3 May 2005.