Optical Backing Storage [Master]


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Optical Backing Storage [Master]

  1. 1. Optical backing storagesuch as CDs and DVDs<br />Advantages<br />they can be transported from one computer to another. Both can be used to store computer data.<br />DVDs are used to hold very large files (several Gb) such as movie films.<br />Disadvantages<br />CDs tend to be used for large files (butsmaller than 1Gb) which are too big for a floppy disc to hold such as music and general animation.<br />Praew<br />
  2. 2. CD ROM and DVD ROMCD-ROM - Compact Disc - Read Only Memory. DVD ROM - Digital Versatile Disk – Read Only Memory[ This means you can only read from the disc, not write or store data onto it.]<br />Advantages<br />Disadvantages<br />They are relatively tough as long as the surface does not get too scratched.<br />CD-ROM&apos;s hold large quantities of data (650 MB). <br />DVD-ROM&apos;s hold large quantities of data (4.7 GB). <br />It can’t be used more than once.<br />You cannot save files to a CD-Rom or DVD-Rom (although CD-R and CD-RW discs now exist which can be written to)<br />Praew<br />
  3. 3. CD R and DVD R<br />Advantages<br />Disadvantages<br />Applications which require a single burning’ of data.<br />you can use a special read/write CD drive unit to store programs and data onto the disc<br />they can only be written to once<br />Data on a DVD-R cannot be changed<br />Praew<br />
  4. 4. CD RW/DVD RW<br />Advantage<br />Disadvantage<br />DVD-RW (DVD-rewritable) can be rewritten multiple (1000+) times. <br />the disc is not ruined and can still store data by erasing the faulty data.<br />These new CD-RW media are labeled as &quot;High Speed&quot; rewritable CD. The same has happened for the DVD-RW too.<br />650MB unformatted CD becomes a 540MB when it has been packet-write formatted.<br />the format process of a CD RW takes a little longer (for example more than 30 minutes with a 2x-speed CD drive). <br />Praew<br />
  5. 5. DVD RAM(DVD-Random Access Memory)<br />Advantage<br />DVD-RAM media have been used in computers as well as camcorders and personal video recorders<br />Can be rewritten over 100,000 times <br />Holds more data when using Double Sided discs than dual-layer DVD+RW and DVD-RW <br />Disadvantage<br />DVD-RAM media have always been more expensive than other types of DVD.<br />Less quality than DVD+RW and DVD-RW.<br />Praew<br />
  6. 6. HD DVD(High Density Digital Versatile Disc) <br />Advantage<br />Disadvantage<br />HD DVD has a maximum of 15 GB (single layer) and 30 GB (dual layer).<br />Discs can have information more tightly packed on the disc.<br />storing data and high-definition video.<br />Cheaper Hardware<br />HD DVD is that it is discontinued.<br />Can hold maximum 30 GB datawhich less than Blu-ray [50 GB]<br />Praew<br />
  7. 7. Blu-ray<br />Advantage<br />Disadvantage<br />Used in video recorders and computer memory<br />Largest storage capacity of optical media.<br />They can have better sound than standard DVD.<br />Expensive discs<br />Long reading times of the discs.<br />Praew<br />
  8. 8. Solid state backing storage<br />Advantage<br />Disadvantage<br />Smallest form of memory, used as removable storage.<br />can be easily written to and updated.<br />More expensive than other forms.<br />A speed to saving data to flash memory is very slow compared to saving it to RAM.<br />Praew<br />
  9. 9. Memory sticks/Pen drives<br />Advantage<br />Memory sticks<br />You can then add files, erase files, etc.<br />you can more easily copy your files onto a memory stick<br />Pen drives<br />the speed of data transfer to or from the pen drive is very high.<br />you can protect the data on your pen drive by making it password protected.<br />Disadvantage<br />Memory sticks<br />Very expensive<br />Pen drives<br />It’s easily lost, as it is so small.<br />Broken easily.<br />Praew<br />
  10. 10. Flash memory cards<br />Advantage <br />Disadvantage<br />Relatively large in space<br />Removable/portable<br />you can find many places to insert them (Camera, computers exe..)<br />Broken easily<br />They are not the fastest<br />Praew<br />