13. Can be easily damaged by breaking or scratching Natcha Navakijthavornkul Natcha Navakijthavornkul
14. CD RW/DVD RW DVDs have between five and ten times the capacity of CDs. CD-RW - CD Read Write Advantages Erasable and rewritable Useful for updating files Useful for making a practice CD or for testing the contents of a CD before making a permanent one Disadvantages Not suitable for music recording More expensive Slower than other types Natcha Navakijthavornkul Natcha Navakijthavornkul
15. DVD RAM Housed in a cartridge. Used in video recorders, camcorders, and computer memory. Advantages Long life — without physical damage, data is retained for an estimated 30 years. For this reason, it has uses in archival storage. Can be rewritten over 100,000 times Reliable writing of discs Disc designed to safeguard data. DVD-burning software may not be required — discs can be used and accessed like a removable hard disk. Very fast access of small files on the disc. Disadvantages Less compatibility than CD-RW and DVD-RW, despite predating both formats 12x media is not reportedly available in Europe, although it is available at Audio Cubes II in the USA. 16x media may not be available anywhere except manufacturers' R&D laboratories. DVD-RAM media have always been more expensive than other types of DVD. Natcha Navakijthavornkul NatchaNavakijthavornkul
16. HD DVD Used in video recorders and computer memory as well as games consoles – main rival to blu-ray. Advantages Very large storage capacity Sound and picture quality is excellent, making them ideal for storing films with video and sound. DVDs are now mass produced so they are relatively cheap DVD players can read CDs Disadvantages DVDs do not work in CD drives There is no single standard of DVD Can be easily damaged by breaking or scratching Natcha Navakijthavornkul Natcha Navakijthavornkul
17. Blu-ray Used in video recorders and computer memory as well as games consoles. Largest storage capacity of optical media. Advantages Huge storage capacity Backwards compatibility In tune with the gaming age 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 The PC geeks are on board Keep on burning Disadvantages Expensive HD versus capacity Movie support, thus far The competition with other brands The cost of films Natcha Navakijthavornkul Natcha Navakijthavornkul
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20. Memory cells have limited lifetimesNatcha Navakijthavornkul Natcha Navakijthavornkul
21. Memory Sticks/Pen Drives Can store up to many Gb. Used to transport files and backup data from computer to computer. Advantages More compact and portable than floppy disks or CDs/DVDs Hold more data than a floppy disk and nowadays often more than a CD More reliable than a floppy disk because they have no moving parts Being developed with fashionable looking outer casings and are almost becoming a 'fashion accessory' much in the way of a mobile phone Disadvantages At the moment, the cost per megabyte of storage is more expensive than floppy disks, CDs or DVDs. Can be easily lost The metal part which is inserted into the USB port can be snapped off if they are handled roughly Natcha Navakijthavornkul Natcha Navakijthavornkul
![Compact Disks [CD] 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't save to it. 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. CD-RW - CD Read Write. -You can save data to your disk over and over again, just like you can with a floppy disk. Advantages ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)