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Storage Devices
 

Storage Devices

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    Storage Devices Storage Devices Presentation Transcript

    • O
      ptical storage devices
      Advantages :
      Disadvantages :
      • With proper care, optical media can last a long time.
      • When data is written to them, they cannot be reused. This is excellent for archiving because data is preserved permanently of being overwritten.
      • Optical media are widely used on other platforms, including the PC.
      • Optical media provide the capability to pinpoint a particular piece of data stored on it, independent of the other data on the volume .
      • The write-once read-many (WORM) ,it excellent for archiving, but it also prevents you from being able to use that media again.
      • The server uses software compression to write compressed data to your optical media. It need the long time to stroe more datas.
      Mai 10RP
    • CD-Rom
      Typical size = 650mb
      Advantages :
      • Data cannot Be erased – you cannot lose your data
      • Easy to carry around
      • Cheap to produce
      • Can Be read By a DVD drive
      Disadvantages :
      • Fragile
      • Can scratch easily – this effects the data when the laser reads it
      • Slower to access than a hard drive
      Mai 10RP
    • DVD-ROM
      Read Only Memory (Read Only)
      Advantages :
      Disadvantages :
      • Can only be used for reading.
      • Movies you buy or rent are usually DVD-ROM.
      • Although some discs can hold up to 17 GB of information.
      • Can hold a minimum of 4.7 GB of movies, music, text, or images.
      • Access rates for DVD ROMs range from 600 Kbps to 1.3 Mbps.
      • Once the information is recorded onto a DVD ROM, it can’t be changed or altered.
      • You may have trouble operating some programs with your DVD ROM drive.
      Mai 10RP
    • CD R/DVD R
      Recordable (Only write one time)
      DVD recordable
      Advantages :
      Disadvantages :
      • Can only be written with -R type drives.
      • Can be read with -R or +R type drives.
      • DVD+R
      • 2 hours of video in SP mode or 4 hours in EP mode
      • Can only be written with +R type drives.
      • Can be read with -R or +R type drives.
      • Data on a DVD-R cannot be changed
      Mai 10RP
    • CDRW/DVDRW
      DVD-rewritable
      Compact Disc Re-Writable
      Advantages :
      Disadvantages :
      • The data burned on a CD-RW cannot be changed
      • you have to completely erase a CD-RW every time you want to change the files or add new data
      • they don't store data reliably for as long as CD-Rs do.
      • A CD-RW can be written to multiple times.
      • CD-RWs a good choice for making frequent backups.
      Mai 10RP
    • DVD RAM
      DVD- Random Access Memory
      Advantages :
      Disadvantages :
      • Long life—  without physical damage
      • Can be rewritten over 100,000 times
      • Disc defect management designed to safeguard data.
      • DVD-burning software may not be required 
      • Less compatibility than DVD+RW and DVD-RW
      • 12x media is not reportedly available in Europe.
      • DVD-RAM media have always been more expensive than other types of DVD.
      Mai 10RP
    • HD DVD
      High-Definition/Density DVD
      Advantages :
      Disadvantages :
      • high-density optical disc format for storing data
      • HD DVD was envisaged to be the successor to the standard DVD format.
      • maximum capacity: 15 GB per layer
      • it’s hard to deny that the HD-DVD player is a great device for the price
      • It’s expensive
      Mai 10RP
    • Blu-ray
      is an optical discstorage medium designed to supersede the standard DVD format.
      Advantages :
      Disadvantages :
      • It’s main uses are for storing high-definition video, PlayStation 3 video games.
      • 25 GB per single layered, and 50 GB per dual layered disc
      • a standard DVD uses a 650 nanometer red laser, Blu-ray uses a shorter wavelength
      • six times more data storage than a DVD
      • It’s too expensive.
      • Blu-ray attempted to woo consumers with awfully big pockets by presenting them
      • Blu-ray disc can't hold much more than four or five hours of high definition content.
      Mai 10RP
    • Solid state backing storage
      Disadvantages :
      Advantages :
      • Smallest form of memory
      • More expensive than
      other forms but can be easily written to and updated.
      • used as removable storage
      More robust than other forms of storage.
      Mai 10RP
    • Memory sticks
      Pen drives
      Advantages :
      Disadvantages :
      • It can be lost.
      • It can be broken, if we dropped.
      • It can lost the information easily.
      • Can store up to many Gb.
      • Used to transport files and backup
      data from computer to computer.
      Mai 10RP
    • Flash memory
      cards
      Advantages :
      Disadvantages :
      • Used in digital cameras, palmtops, mobile phones, MP3
      players.
      Mai 10RP
      • It can be lost and broken