Download
hard drives n.
Skip this Video
Loading SlideShow in 5 Seconds..
Hard Drives PowerPoint Presentation
Download Presentation
Hard Drives

Hard Drives

204 Views Download Presentation
Download Presentation

Hard Drives

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Hard Drives By - Tom Tenner

  2. History • Pre-disks: Drums • 1950, Engineering Research Associates of Minneapolis built first commercial magnetic drum storage unit • ERA 110 • Could store one million bits of data

  3. History (cont.) • 1956, IBM invents first computer storage system • Could store 5 MB • Had fifty 24-inch diameter disks • In 1973 IBM shipped the model 3340 Winchester sealed hard disk drive, • Had two spindles each with a capacity of 30MB

  4. History (cont.) • 1980 - Seagate Technology introduced the first hard disk drive for microcomputers. held 5 Mbytes. • Also in 1980, Phillips introduced the first optical laser drive. • In 1997 Seagate introduced the first 7,200 RPM, hard disk drive for desktop computers and in February of this year they introduced the first 15,000 RPM hard disk drive

  5. Features • Magnetic recording material • Layered on high-precision aluminum or glass disk • Polished to mirror-type smoothness • Move to any piece of information instantly • Data stored in very small domains

  6. How Does It Work? • Hard drives store info by magnetism • Stores on large disk called a platter • Divided into billions of tiny areas • Each is separately magnetized • Stored in binary form: either 0 or 1 • Sectors and tracks • Sectors contained fixed # of bytes

  7. How Does It Work? • Most have only one platter • Although has two sides of magnetic coating • Arms containing skim over platter • Read-write head magnetize byte • Two read-write heads per platter

  8. Components • Two main sections/pieces inside drive • Electronics board • Rest of components

  9. Components • Actuator - Small electronic motor - Moves read/write arm

  10. Components 2. Read-Write Arm - Swings across platter - Carries Read-Write head

  11. Components • Center Spindle - Spins the platter - Extremely high speeds

  12. Components • Platter - Stores data in binary form

  13. Components • Plug connectors • Link hard drive to motherboard

  14. Components • Read-write head - Tiny magnet at end of arm

  15. Components • Circuit/Electronics Board - Controls flow of data to/from read-write head and platter

  16. Components • Flexible connector - Carries data from circuit board to read-write head and platter

  17. Components • Spindle • Small motor • Spins read-write arm

  18. Different types - IDE • Integrated Drive Electronics • Small circuit board with chips • Provide guidance • Includes memory • Serves as buffer to enhance hard drive performance

  19. Different Types - SATA • Serial Attached Technology Advancement • Interface to connect host adaptors to storage systems • SATA replaced ATA • Reduced cable-bulk and cost • Faster

  20. Different Types - Scuzzy • Storage device, utilizes SCSI • Small Computer System Interface • Expensive • High reliability, performance speed • SCSI drives can communicate directly with each other • Don’t need to use computer’s processing power • Chains • Up to 16

  21. Different Types – EIDE • Enhanced IDE • Supports 3-4x faster data rates than original • Standard • Interface built into motherboard • Requires no slots • Mostly same as SCSI • Different electronics

  22. Manufacturers • Fujitsu • IBM • Seagate • Samsung • Western Digital • Hitachi

  23. Prices • Western Digital AV WD3200AVJS 320GB 7200 RPM 8MB Cache SATA 3.0Gb/s • $49.99 • Western Digital WD5000AAKS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s • $54.99 • Western Digital WD10EADS 1TB 32MB Cache SATA 3.0Gb/s • $79.99

  24. Sources. • http://www.duxcw.com/digest/guides/hd/hd2.htm • http://computer.howstuffworks.com/hard-disk.htm • http://www.explainthatstuff.com/harddrive.html • http://computer.howstuffworks.com/ide.htm