Storage Devices


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Storage Devices

  1. 1. Storage Devices<br />By: Nat 10RP<br />
  2. 2. Compact Disks [CD]<br />CD-ROM - CD Read Only Memory. -When you buy the disk, it already has the data or program stored on it. You can read it, but can&apos;t save to it. <br />CD-WORM - CD Write Once Read Many -You are able to save to this disk one time, so you can store your data or an application on it of your choice. <br />CD-RW - CD Read Write. -You can save data to your disk over and over again, just like you can with a floppy disk. <br />Advantages<br /><ul><li>Small and portable
  3. 3. Very cheap to produce
  4. 4. Most computers can read CDs. If there is no CD drive, a DVD drive can usually read them
  5. 5. Fairly fast to access the data - quicker than a floppy disk or magnetic tape </li></ul>Disadvantages<br /><ul><li>Fairly fragile, easy to snap or scratch
  6. 6. Smaller storage capacity than a hard drive or DVD
  7. 7. Slower to access than the hard disk. </li></ul>Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  8. 8. Digital Versatile Disk [DVD]<br />Single side can store 4.7 GB of data.<br />Advantages<br /><ul><li>Very large storage capacity
  9. 9. Sound and picture quality is excellent, making them ideal for storing films with video and sound.
  10. 10. DVDs are now mass produced so they are relatively cheap
  11. 11. DVD players can read CDs </li></ul>Disadvantages<br /><ul><li>Do not work in CD drives
  12. 12. There is no single standard of DVD
  13. 13. Can be easily damaged by breaking or scratching </li></ul>Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  14. 14. CD RW/DVD RW<br />DVDs have between five and ten times the capacity of CDs.<br />CD-RW - CD Read Write<br />Advantages<br />Erasable and rewritable<br />Useful for updating files<br />Useful for making a practice CD or for testing the contents of a CD before making a permanent one<br />Disadvantages<br />Not suitable for music recording<br />More expensive<br />Slower than other types<br />Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  15. 15. DVD RAM<br />Housed in a cartridge. <br />Used in video recorders, camcorders, and computer memory.<br />Advantages<br />Long life — without physical damage, data is retained for an estimated 30 years. For this reason, it has uses in archival storage.<br />Can be rewritten over 100,000 times <br />Reliable writing of discs<br />Disc designed to safeguard data. <br />DVD-burning software may not be required — discs can be used and accessed like a removable hard disk. <br />Very fast access of small files on the disc. <br />Disadvantages<br />Less compatibility than CD-RW and DVD-RW, despite predating both formats<br />12x media is not reportedly available in Europe, although it is available at Audio Cubes II in the USA. <br />16x media may not be available anywhere except manufacturers&apos; R&D laboratories. <br />DVD-RAM media have always been more expensive than other types of DVD. <br />Natcha Navakijthavornkul<br />NatchaNavakijthavornkul<br />
  16. 16. HD DVD<br />Used in video recorders and computer memory as well as games consoles – main rival to blu-ray.<br />Advantages<br />Very large storage capacity <br />Sound and picture quality is excellent, making them ideal for storing films with video and sound. <br />DVDs are now mass produced so they are relatively cheap <br />DVD players can read CDs <br />Disadvantages<br />DVDs do not work in CD drives <br />There is no single standard of DVD <br />Can be easily damaged by breaking or scratching <br />Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  17. 17. Blu-ray<br />Used in video recorders and computer memory as well as games consoles. <br />Largest storage capacity of optical media.<br />Advantages<br />Huge storage capacity<br />Backwards compatibility<br />In tune with the gaming age<br />Available, in limited supply, to the Japanese market for a few years now. That means it’s been tested by our friends in the Far East, which makes the buy a bit less think<br />The PC geeks are on board<br />Keep on burning<br />Disadvantages<br />Expensive<br />HD versus capacity<br />Movie support, thus far<br />The competition with other brands<br />The cost of films<br />Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  18. 18. Solid Backing Storage<br />Smallest form of memory, used as removable storage. More robust than other forms of storage. More expensive than other forms but can be easily written to and updated.<br />Advantages<br />Faster start-up because no spin-up is required. <br />Fast random access because there is no read/write head<br /><ul><li>Low read latency times for RAM drives In applications where hard disk seeks are the limiting factor, this results in faster boot and application launch times. Consistent read performance because physical location of data is irrelevant for SSDs.
  19. 19. File fragmentation has negligible effect. </li></ul>Silent operation due to the lack of moving parts. <br />Disadvantages<br /><ul><li>More expensive than other forms
  20. 20. Memory cells have limited lifetimes</li></ul>Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  21. 21. Memory Sticks/Pen Drives<br />Can store up to many Gb. <br />Used to transport files and backup data from computer to computer.<br />Advantages<br />More compact and portable than floppy disks or CDs/DVDs<br />Hold more data than a floppy disk and nowadays often more than a CD<br />More reliable than a floppy disk because they have no moving parts <br />Being developed with fashionable looking outer casings and are almost becoming a &apos;fashion accessory&apos; much in the way of a mobile phone<br />Disadvantages<br />At the moment, the cost per megabyte of storage is more expensive than floppy disks, CDs or DVDs. <br />Can be easily lost <br />The metal part which is inserted into the USB port can be snapped off if they are handled roughly <br />Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />
  22. 22. Flash Memory Cards<br />Used in digital cameras, palmtops, mobile phones, MP3 players.<br />Advantages<br /><ul><li>Highest Read/Write Speeds
  23. 23. Highest Card Capacities
  24. 24. 100% Compatibility</li></ul>Disadvantages<br /><ul><li>Purely for data storage, or data transfer between two computers.
  25. 25. No digital cameras which can read or write to these flash drives.
  26. 26. Best suited for creating backups of important data, and for copying files between computers.</li></ul>Natcha Navakijthavornkul<br />Natcha Navakijthavornkul<br />