2. When data is written to them, they cannot be reused. This is excellent for archiving because data is preserved permanently of being overwritten.

3. Optical media are widely used on other platforms, including the PC.

4. Optical media provide the capability to pinpoint a particular piece of data stored on it, independent of the other data on the volume .

5. The write-once read-many (WORM) ,it excellent for archiving, but it also prevents you from being able to use that media again.

6. The server uses software compression to write compressed data to your optical media. It need the long time to stroe more datas.Mai 10RP

8. Easy to carry around

9. Cheap to produce

11. Can scratch easily – this effects the data when the laser reads it

12. Slower to access than a hard driveMai 10RP

14. Movies you buy or rent are usually DVD-ROM.

15. Although some discs can hold up to 17 GB of information.

16. Can hold a minimum of 4.7 GB of movies, music, text, or images.

17. Access rates for DVD ROMs range from 600 Kbps to 1.3 Mbps.

18. Once the information is recorded onto a DVD ROM, it can’t be changed or altered.

19. You may have trouble operating some programs with your DVD ROM drive.Mai 10RP

21. Can be read with -R or +R type drives.

22. DVD+R

23. 2 hours of video in SP mode or 4 hours in EP mode

24. Can only be written with +R type drives.

25. Can be read with -R or +R type drives.

26. Data on a DVD-R cannot be changedMai 10RP

28. you have to completely erase a CD-RW every time you want to change the files or add new data

29. they don't store data reliably for as long as CD-Rs do.

30. A CD-RW can be written to multiple times.

31. CD-RWs a good choice for making frequent backups.Mai 10RP

33. Can be rewritten over 100,000 times

34. Disc defect management designed to safeguard data.

35. DVD-burning software may not be required

36. Less compatibility than DVD+RW and DVD-RW

37. 12x media is not reportedly available in Europe.

38. DVD-RAM media have always been more expensive than other types of DVD.Mai 10RP

40. HD DVD was envisaged to be the successor to the standard DVD format.

41. maximum capacity: 15 GB per layer

42. it’s hard to deny that the HD-DVD player is a great device for the price

43. It’s expensive Mai 10RP

45. 25 GB per single layered, and 50 GB per dual layered disc

46. a standard DVD uses a 650 nanometer red laser, Blu-ray uses a shorter wavelength

47. six times more data storage than a DVD

48. It’s too expensive.

49. Blu-ray attempted to woo consumers with awfully big pockets by presenting them

50. Blu-ray disc can't hold much more than four or five hours of high definition content.Mai 10RP

54. It can be broken, if we dropped.

55. It can lost the information easily.

56. Can store up to many Gb.

57. Used to transport files and backupdata from computer to computer. Mai 10RP