Storage Devices
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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
    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
    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- 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
    Advantages :
    Disadvantages :
    • Used in digital cameras, palmtops, mobile phones, MP3
    Mai 10RP
    • It can be lost and broken