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Unit 7 Notes

Unit 7 Notes. Auxiliary Storage Computers are off today. What is Auxiliary Storage?. Stores programs and data when they are not being processed (used) by the computer. Examples: Disk Drives So what’s Primary Storage? Main Memory. Volatile vs.Non-Volatile. Volatile – fragile, unstable.

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Unit 7 Notes

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  1. Unit 7 Notes Auxiliary Storage Computers are off today

  2. What is Auxiliary Storage? Stores programs and data when they are not being processed (used) by the computer. Examples: Disk Drives So what’s Primary Storage? Main Memory

  3. Volatile vs.Non-Volatile Volatile – fragile, unstable main memory – turn the computer off and your lose your work Non-Volatile – peaceful, stable auxiliary storage – turn the computer off and your work is still there.

  4. Hard Disk or Floppy? Floppy! Standard Size is 3 ½”

  5. How A Disk Drive Works • Disk Spins • Read/Write head moves across the surface of the disk.

  6. Floppy Disk Construction Track – a narrow recording band forming a complete circle around the disk. Sector – is a piece/ section of the track

  7. Formatting Formatting is the process which includes defining the tracks and sectors on the surface of the disk

  8. Write Protection Notch • Prevents data from being written to or deleted from the disk. • On a 3 ½” Disk, an Open window is write protected

  9. How many tracks on a CD-ROM? • One! It’s a spiral! Similar to an old record

  10. Hard Disk Drives Advantages • Fixed inside the computer (safe) • Much Faster than a floppy, zip, CD-ROM • Store much more data than other drives. How Big are Hard Drives? • 40 Gb standard, 80+ Gb not unusual

  11. IDE Most common type of drive is IDE IntegratedDeviceElectronics IDE drives include Hard Drives, CD-ROM’s, Floppy Drives, Tape Drives, (all are internal)

  12. SCSI Another type of drive is SCSI SmallComputer SystemInterface (Faster, more versatile, more $, than IDE)

  13. USB • Universal Serial Bus • Very portable storage devices including Key/Flash Drives.

  14. Disk Cartridge Basically a portable hard drive. {Zip Disk/Drive} Also Jazz Drives (ec)

  15. Cartridge Tape Method of backup storage for PC (very slow) Looks like a cassette tape Being replaced by CD-ROMS as a method of backup

  16. Optical Disks Optical – Think eyes or optometrist. uses a laser to read data off a disk.

  17. Optical Disks CD-ROM: Compact Disk, Read Only Memory CD-R: Compact Disk – Recordable CD-RW: Compact Disk – ReWriteable DVD- Digital Video Disk

  18. Solid-State Devices • The data is held in memory, so there are no moving mechanical parts to break.. These solid-state chips are nonvolatile, which means the drive does not need electrical power to hold its content over time (no batteries).Examples: • Flash “Pen” Drives • Digital Camera Smart Media Cards

  19. Mass Storage Devices like a computer Juke Box Example: CD-ROM Tower

  20. What is RAID • Redundant Arrays of Inexpensive Disks • Provides: • Better performance than a single drive • Data Security

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