CDs

1
CDs

• CD replaced vinyl records and audiocassettes for
  most users. CD ROMs have replaced floppy disks.
• CDs are 120mm discs that contain a layer of
  reflective metal-alloy foil encased in
  transparent plastic.
• The CD contain a single spiral track .
• 74 minutes CD 650 MB data, 80 minute CD 700
  MB data
• We were only just getting used to the notion that
  those 50GB Blu-ray discs and recorders were
  totally beyond our reach when the news comes that
  Sony is prepping an even more capacious 8-layer
  version of the Blu-ray disc that can hold up to
  200GB of data. No word on when it'll hit, but a
  4-layer version with storage capacity of 100GB is
  expected in 2007, so it'll be sometime after
  that.

2
Components of a CD
3
Recordable CDs

• Process is called burning
• CD-R can be written once and read many times
  (single session disks)
• Composed of gold metal alloy and organic dye
  (laser heated)
• CD-RW can be written multiple times (silver alloy
  layer)-multi session disks.

4
CD Drives

• Standard on computer systems today
• Come in two types
• -CD-ROM driveCan only read CDs.
• -CD-RW drivesCan read from and write to CDs.

5
CD drive components
Laser
Reads the disk
Spindleholds the CD in place during spinning
Tray hold the CD in place
6
CD drive components

• Control buttons--start, stop, Next Track and
  previous track
• Headphone jack
• Volume control dial
• Manual eject hole

7
CD drive speeds

• Expressed as xX
• x number of times faster the rate of CD spin
• 1X spins 210 to 539 RPM
• 2X twice as fast as 1X
• xX accurate up to 12X

8
DVDs

• 12 cm diameter like CDs
• Thinner than CDs
• Uses different encoding method CDs
• Requires a narrower laser beam, higher density
• DVD 0.74 microns wide CD1.6 microns wide
• DVD-R and DVD-RW
• Internal or external
• Internal IDE, Serial ATA, SCSI
• External FireWire or USB 2.0
• 1X to 16X (1X transfers 1.38 MB per sec)
• To play a movie the system needs an MPEG-2
  decoder (b4 was incorporated in graphics card,
  current software decoders)

9
DVD types

• Standard DVD disc 4.7 GB capacity
• DVD discs contain the UDF (Universal Disk Format)
  file system.
• DVD-5
• DVD-9
• DVD-10
• DVD-14
• DVD-18

10
Optical drive installation

• Need a horizontal 5.25 drive bay
• Verify interface and power cables can reach the
  optical drive
• Verify audio cable reaches the sound card
• Set jumpers on IDE drive to Master, Slave, or
  Cable Select
• On SCSI drive, set SCSI ID
• Install drive in bay according to your case
  specification
• Verify drive door opens freely
• If necessary, install drivers

11
Optical drive connections
12
What do you want to do? options
13
Using CD and DVD drives

• Read and write CDs using Windows Media player
• Other CD read/write apps
• RealPlayer
• Easy CD Creator
• Sonic RecordNow!
• Play DVDs using Windows Media Player
• Must install DVD decoder
• Download Windows XP Video Decoder Checkup utility
  from microsoft.com

14
USB flash drives
Typically USB flash drives are composed
of -Controller with USB interface -Non volatile
memory interface connected to memory -LED to
indicate drive capacity
Many flash drives come with one or more security
features -Encryption -Password
protection -Finger print sensor
Optionally the might include -Crystal for
external clock generation on high speed
drives -Write protected switch -Finger print
sensor MP3 player integrated
15
Flash MP3 player
16
Floppy disks, floppies, diskettes
17
5.25 floppy disk
18
3.5 floppy disk