The document discusses different types of storage media including magnetic tape, optical disks, compact disks, and digital versatile disks. It describes the key characteristics of each type of media such as storage capacity, read/write capabilities, and common uses. The document also covers components needed for multimedia, including optical disk drives, sound cards, speakers, headphones, microphones, graphics cards, and processors.

1. Storage and Multimedia Chapter 6 B.M.H

2. Index Magnetic Tape Storage Optical Disk Storage Multimedia

3. Secondary Storage Magnetic storage Disk storage Floppy disk Hard disk Tape storage Optical storage CD DVD

4. Magnetic disk storage

5. Magnetic Tape Storage Plastic tape with a magnetic coating Looks like the tape used in music cassettes Magnetic media Data is stored as extremely small magnetic spots

6. Magnetic Tape Storage Form ½-inch-wide tape wound on a reel ¼-inch-wide in data cartridges and cassettes Tapes like ordinary music cassettes

8. Magnetic Tape Storage Capacity Expressed in terms of density : which is the number of characters per inch (cpi) or bytes per inch (bpi) that can be stored on the tape

9. Magnetic Tape Storage The primary role of tape, today An inexpensive backup medium Because disks are the superior storage medium Quite reliable within as sealed module Can be accessed directly, in contrast to sequential data on tape

10. Backup Systems The causes of loss of data on a hard disk Physical damage from fire and natural disasters Electromechanical failures Errors introduced by users Errors introduced by software  Backup is vital

11. Backup System A way of storing data in more than one place to protect it from damage and errors The primary storage for backup Magnetic tape

12. Backup System Tape backup system Copying all data from hard disk to a single tape in minutes Can be scheduled to take place when you do not use the computer Tape cartridges with more than 10GB available at reasonable cost CD-R, and CD RW media for backup Limited to storing less than 1GB of data

14. Optical disk storage Stores data as microscopic light and dark spots on the disk surface The dark spots Called pits Represent as the 1s The lighter, non-pitted surface areas Called lands Represent as the 0s

15. Optical disk storage Technology : A laser hits a layer of metallic material spread over the surface of a disk To write data Heat from the laser produces tiny spots, or pits, on the disk surface To read data The laser scans the disk, and a lens picks up light reflections from the spots

17. Optical disk storage Advantage Inexpensive and compact storage with greater capacity Less affected to environmental damage than magnetic media

18. Optical storage technology Category : According to its read/write capability Read-only media WORM media MO media

19. Optical storage technology Read-only media Recorded by the manufacturer Can be read from by the user but not written to by the user Used to supply software not for user’s files

20. Optical storage technology WORM media : Write-Once, Read-Many May be written to once Once filled, it becomes a read-only medium Nonerasaible Used for secure storage of original versions of valuable documents or data

21. Optical storage technology MO media : Magneto-Optical Hybrid type of disk : Combines the best features of magnetic and optical disk technologies Has the high-volume capacity of an optical disk Can be written over like a magnetic disk

22. Optical disk storage Types CD: C ompact D isks DVD : D igital V ersatile D isks

23. Compact disks Technology An optical technology that uses the same media used for audio CDs Computer CD drives Can play audio CDs, with the proper software

24. Compact disks Types ; according to the ability to read and write CD- ROM CD- R CD- RW

25. Compact disks CD- ROM : Compact Disk Read-Only Memory Storage : up to 700 megabytes per disk Format : identical to that of audio CD The primary medium for SW distribution CD-ROM drive Capable only of reading data from CDs

26. Compact disks CD- R : Compact Disk-Recordable Permits writing just once on optical disk Requires a CD-R drive, special CD-R disks and the CD-R software Once written on, it can be read also by CD-ROM drive, not only CD-R

27. Compact disks CD- RW : Compact Disk-ReWritable Allow to erase and record over data multiple times Requires a CD-RW drive, special CD-RW disks and the CD-RW software Most of today’s optical drives now read CD-RW disks

28. Digital Versatile Disk Originally D igital Video D isk Technology A variation of CD technology that was designed to provide enough storage capacity for a full-length movie Uses a laser with a shorter wavelength permitting it to read more densely packed spots thus increasing the disk capacity

29. DVD Types DVD- ROM DVD- RAM DVD+ RW

30. DVD-ROM Capacity Single-sided : up to 4.7-gigabyte Double-layered DVD : about 8.5-GB Double-sided : to 17-GB  Diskette (*450) << CD-ROM (*7) < DVD-ROM

31. DVD-ROM Used for holding movies Exquisite sound, full-length movies Suited for distributing large multimedia applications Games, encyclopedias, maps, and telephone number databases Require a DVD drive Also can read data from CD-ROM, CD-R and CD-RW

32. DVD-RAM Writable version of DVD Stores 5.2-GB on a double-sided disk Readable only by DVD-RAM drives

33. DVD+RW Technology very similar to CD-RWs DVD-RAM and DVD+RW technologies are not compatible Disks created by a DVD-RAM drive cannot be used in a DVD+RW drive, and vice versa

34. Multimedia

35. Multimedia Requires sound and graphics capability Equipment CD-ROM or DVD-ROM drive Sound card or sound chip Speakers Headphones Microphone Graphics card Speedy processor chip

36. Multimedia Equipment CD-ROM or DVD-ROM drive To access audio and software CD/DVD-ROMs Multimedia elements had better be stored on a CD-ROM /DVD-ROM than on a hard disk For the amounts of the multimedia data are huge Insert only when user want to access them The higher the drive speed, the faster the transfer of data and the smoother the video showing on the screen

37. Multimedia Equipment Sound card Gives a computer the capability to record and play sound files Contains connectors to attach speakers, headphones and a microphone High-performance sound card include circuitry for special audio effects such as 3-D sound

38. Multimedia Equipment The quality of speakers and headphones Affect the quality of the sound that user hears

39. Multimedia Equipment Speaker Inexpensive one Provide basic radio-quality sound Top-quality Boosts the bass sound and screens out background noise

40. Multimedia Equipment Headphone Inexpensive one Can be used from a portable CD player Better-quality Produce clearer sound

41. Multimedia Equipment Microphone Basic Suitable for voice recording and dictation Professional For recording instrumental music and vocals

42. Multimedia Equipment Graphics card Takes signals from the processor and uses them to “paint” an image on the screen Provides a connection for the monitor’s data cable “ accelerated” graphics cards equipped with circuitry that optimizes to display videos

43. Multimedia Equipment Processor should quickly handle the huge amount of digital data for multimedia The faster the processor, the more data it can process each second ; the better multimedia quality smooth video sequences a sound track perfectly coordinated with the action Processor chips with Intel’s MMX or AMD’s 3DNow! Enhance a computer’s multimedia performance