LG GSA-4167B, GSA-4168B, GSA-4165B User Manual

5 (1)

Super Multi DVD Drive

SERVICE MANUAL

MODEL: GSA-4165B/

GSA-4167B/

GSA-4168B

P/NO : 3828HS1047G

August 2005

Printed in Korea

MODEL : GSA-4165B/GSA-4167B/GSA-4168B

 

TABLE OF CONTENTS

 

INTRODUCTION .......................................................................................................................................................................

3

FEATURES............................................................................................................................................................................

3~5

SPECIFICATIONS.................................................................................................................................................................

6~9

LOCATION OF CUSTOMER CONTROLS .......................................................................................................................

10~11

DISASSEMBLY .................................................................................................................................................................

12~13

1. CABINET and CIRCUIT BOARD DISASSEMBLY ..........................................................................................................

12

1-1. Bottom Chassis..........................................................................................................................................................

12

1-2. Front Bezel Assy........................................................................................................................................................

12

1-3. Cabinet and Main Circuit Board .................................................................................................................................

12

2. MECHANISM ASSY DISASSEMBLY..............................................................................................................................

12

2-1. Pick-up Unit................................................................................................................................................................

12

2-2. Pick-up ......................................................................................................................................................................

13

EXPLODED VIEW .............................................................................................................................................................

14~15

MECHANICAL REPLACEMENT PARTS LIST ................................................................................................................

16~18

GLOSSARY .............................................................................................................................................................................

19

THE DIFFERENCES OF CD-R/CD-RW DISCS AND GENERAL CD-ROM.....................................................................

20~26

1.

Recording Layer ..............................................................................................................................................................

20

2.

Disc Specification ............................................................................................................................................................

20

3.

Disc Materials ..................................................................................................................................................................

21

4.

Reading Process of Optical Disc .....................................................................................................................................

22

5.

Writing Process of CD-R Disc .........................................................................................................................................

23

6.

Writing Process of CD-RW Disc ......................................................................................................................................

23

7.

Organization of the PCA, PMA and Lead-in Area ...........................................................................................................

24

8.

Function of PCA and PMA area ......................................................................................................................................

25

9. OPC and ROPC ..............................................................................................................................................................

25

10. Writing Process of DISC................................................................................................................................................

26

THE DIFFERENCES OF DVD-R/RW, DVD+R/RW DISCS AND DVD-ROM....................................................................

27~35

1.

Recording Layer ..............................................................................................................................................................

27

2.

Disc Specification ............................................................................................................................................................

28

3.

Disc Materials ..................................................................................................................................................................

28

4.

Writing Pulse Waveform of DVD+R.................................................................................................................................

31

5.

Writing Pulse Waveform DVD+RW .................................................................................................................................

33

6.

Organization of Inner Drive Area, Outer Drive Area, Lead-in Zone and Lead-out Zone .................................................

34

LightScribe MEDIA...........................................................................................................................................................

36~39

1.

LightScribe Media............................................................................................................................................................

36

2.

Hardware Block Diagram of LightScribe Label Printing...................................................................................................

37

3.

MD Assy For LightScribe.................................................................................................................................................

38

4.

Optical Encoder Assy ......................................................................................................................................................

39

DVD & CD DATA PROCESSING......................................................................................................................................

40~43

1.

Data Processing Flow......................................................................................................................................................

40

2.

Copy Protection and Regional Code Management Block ...............................................................................................

41

3.

About Prevention the DVD-ROM from to be copy ...........................................................................................................

42

4.

About the DVD-ROM Regional Code ..............................................................................................................................

43

INTERNAL STRUCTURE OF THE PICK-UP....................................................................................................................

44~46

1.

Block Diagram of the Pick-up(HOP-7632TS) ..................................................................................................................

44

2.

Pick up Pin Assignment...................................................................................................................................................

45

3.

Signal detection of the P/U ..............................................................................................................................................

46

DESCRIPTION OF CIRCUIT.............................................................................................................................................

47~53

1.

ALPC Circuit ....................................................................................................................................................................

47

2.

Focus Circuit....................................................................................................................................................................

49

3.

Tracking & Sled Circuit ....................................................................................................................................................

50

4.

Spindle Circuit .................................................................................................................................................................

53

MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION.............................................................................

55~72

TROUBLESHOOTING GUIDE ..........................................................................................................................................

73~90

BLOCK DIAGRAM ..................................................................................................................................................................

91

PRINTED CIRCUIT BOARD DIAGRAM ...........................................................................................................................

92~96

ELECTRICAL REPLACEMENT PARTS LIST ........................................................................................................................

97

CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM.

INTRODUCTION

This service manual provides a variety of service information.

It contains the mechanical structure of the Super Multi DVD Drive and the electronic circuits in schematic form. This Super Multi DVD Drive was manufactured and assembled under our strict quality control standards and meets or exceeds industry specifications and standards.

This Super Multi DVD drive is an internal drive unit designed for use with IBM PC, HP Vectra, or compatible computer. It can write as much as 700 Mbytes of digital data into CD-R/RW disc, and can read as much as 700 Mbytes of digital data stored in a CD-ROM/R/RW disc.

It can write as much as 4.7Gbytes of digital data into DVD-R/RW/RAM/+R/+RW disc, and can read as much as 4.7Gbytes of digital data stored in a DVD-ROM/R/RW/RAM/+R/+RW disc.

It can write as much as 8.5Gbytes of digital data into DVD+R DL/DVD-R DL disc, and can read as much as 8.5Gbytes of digital data stored in a DVD-ROM DL/+R DL/-R DL disc.

This Super Multi DVD Drive can easily meet the upcoming MPC level 3 specification, and its Enhanced Intelligent Device Electronics (E-IDE) and ATAPI interface allows Plug and play integration in the majority of today’s PCs without the need of an additional interface card.

1. Support feature and writable disc

*) Indicated write-in speed is a value at the time of the fastest operation.

 

 

 

 

G*A-4165B

 

 

 

 

 

 

 

 

 

 

 

 

GSA

GMA

GWA

GRA

GCA

GDA

 

Light Scribe

x

x

x

x

x

x

 

CD-R

48x write

48x write

48x write

48x write

48x write

read only

 

CD-RW

32x write

32x write

32x write

32x write

32x write

read only

 

DVD-R

16x write

16x write

16x write

read only

16x write

16x write

 

DVD-RW

4x or 6x write

4x or 6x write

4x or 6x write

read only

4x or 6x write

4x or 6x write

 

DVD-R DL

4x write

4x write

4x write

read only

4x write

4x write

 

DVD+R

16x write

read only

16x write

16x write

read only

read only

 

DVD+RW

8x write

read only

8x write

8x write

read only

read only

 

DVD+R DL

4x or 6x write

read only

4x or 6x write

4x or 6x write

read only

read only

 

DVD-RAM

5x write

5x write

read only

read only

read only

5x write

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G*A-4167B

 

 

 

 

 

GSA

GMA

GWA

GRA

GCA

GDA

 

Light Scribe

x

x

x

x

x

x

 

CD-R

48x write

48x write

48x write

48x write

48x write

read only

 

CD-RW

32x write

32x write

32x write

32x write

32x write

read only

 

DVD-R

16x write

16x write

16x write

read only

16x write

16x write

 

DVD-RW

6x write

6x write

6x write

read only

6x write

6x write

 

DVD-R DL

4x write

4x write

4x write

read only

4x write

4x write

 

DVD+R

16x write

read only

16x write

16x write

read only

read only

 

DVD+RW

8x write

read only

8x write

8x write

read only

read only

 

DVD+R DL

6x write

read only

6x write

6x write

read only

read only

 

DVD-RAM

5x write

5x write

read only

read only

read only

5x write

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G*A-4168B

 

 

 

 

 

GSA

GMA

GWA

GRA

GCA

GDA

 

Light Scribe

O

O

O

O

O

O

 

CD-R

48x write

48x write

48x write

48x write

48x write

read only

 

CD-RW

32x write

32x write

32x write

32x write

32x write

read only

 

DVD-R

16x write

16x write

16x write

read only

16x write

16x write

 

DVD-RW

6x write

6x write

6x write

read only

6x write

6x write

 

DVD-R DL

4x write

4x write

4x write

read only

4x write

4x write

 

DVD+R

16x write

read only

16x write

16x write

read only

read only

 

DVD+RW

8x write

read only

8x write

8x write

read only

read only

 

DVD+R DL

6x write

read only

6x write

6x write

read only

read only

 

DVD-RAM

5x write

5x write

read only

read only

read only

5x write

 

 

 

 

 

 

 

 

3

FEATURES

1General

1)Enhanced IDE (ATAPI) interface.

2)Internal Half-height Drive.

3)CD-R/RW, DVD-R/-R DL(Dual Layer)/-RW/RAM/+R/+R DL(Double Layer)/+RW read and write compatible CD Family and DVD-ROM read compatible.

4)Buffer Under-run prevention function embedded.

5)2MB buffer memory.

6)Power loading and power eject of a disc. Bare media loading.

7)MTBF : 100,000 POH

8)Vertical and Horizontal installable.

2.Supported disc formats

1)Reads data in each DVD-ROM, DVD-R(Ver. 2.0 for Authoring) and DVD-RAM(Ver.1.0)

2)Reads and writes in each DVD-R(Ver. 2.0 for General), DVD-R DL(Dual Layer), DVD-RW, DVDRAM(Ver.2.2), DVD+R, DVD+R DL(Double Layer) and DVD+RW

3)Reads data in each CD-ROM, CD-ROM XA, CD-I, Video CD, CD-Extra and CD-Text

4)Reads data in Photo CD (Single and Multi session)

5)Reads standard CD-DA

6)Support to read Super Audio CD(Compatible layer in Hybrid type)

7)Reads and writes CD-R discs conforming to “Orange Book Part 2”

8)Reads and writes CD-RW discs conforming to “Orange Book Part 3”

9)Reads DVD-RAM with CPRM and DVD-RW with CPRM

3.Supported write method

1)DVD-R: ..................Disc at Once and Incremental Recording

2)

DVD-R DL .............

Disc at Once, incremental Recording and Layer jump recording

3) DVD-RW:...............

Disc at Once, Incremental Recording and Restricted Overwrite

4) DVD-RAM:.............

Random Write

5)

DVD+R: .................

Sequential Recording

6)

DVD+R DL: ...........

Sequential Recording

7) DVD+RW:..............

Random Write

8)

CD-R/RW: .............

Disc at Once, Session at Once, Track at Once and Packet Write

4

4. Performance

1) Average access time:

DVD-ROM

145 ms

(1/3 stroke)

 

CD-ROM

125 ms

2) Write speed:

 

DVD-R

2x, 4x CLV, 8x ZCLV, 16x PCAV

 

 

DVD-R DL

2x, 4x CLV

 

 

DVD-RW

1x, 2x, 4x, 6x CLV

 

 

DVD-RAM

2x, 3x ZCLV (Ver.2.2), 3x-5x PCAV(Ver.2.2)

 

 

DVD+R

2.4x, 4x CLV, 8x ZCLV, 12x, 16x PCAV

 

 

DVD+R DL

2.4x, 4x, 6x CLV

 

 

DVD+RW

2.4x, 4x CLV, 8x ZCLV

 

 

CD-R

4x, 8x, 16x CLV, 24x, 32x, 40x, 48x ZCLV

 

 

CD-RW

4x, 10x, 16x CLV, 24x, 32x ZCLV

 

 

 

(High Speed: 10x, Ultra Speed: 16x, 24x, 32x)

3) Read speed:

DVD-R/RW/ROM/ROM-Dual layer

10x / 8x / 16x / 12x max.

 

 

DVD-R DL

8x max.

 

 

DVD-RAM (Ver.1.0/2.2)

2x / 2x, 3x ZCLV, 3x-5x PCAV

 

DVD-Video(CSS Compliant Disc)

8x max. (Single/Dual layer)

 

 

DVD+R/+RW

10x / 8x max.

 

 

DVD+R DL

8x max.

 

 

CD-R/RW/ROM

48x/40x/48x max.

 

 

CD-DA (DAE)

40x max.

 

 

80mm CD

16x max.

4) Sustained Transfer rate:

DVD-ROM

22.16 Mbytes/s (16x) max.

 

 

CD-ROM

7,200 kB/s (48x) max.

5) Burst Transfer rate:

 

Ultra DMA Mode2

 

 

 

Multi word DMA Mode2, PIO Mode 4

6)Multimedia MPC-3 compliant

5.Audio

1)16 bit digital data output through ATA interface

2)Software Volume Control

3)Equipped with audio line output for audio CD playback

*Definition

 

 

Transfer Rate:

.........1x (DVD) = 1.385 Mbytes/s

..........1x (CD) = 150 kB/s

 

Mbytes/s = 106 bytes/s, ................kB/s = 210 bytes/s

Capacity: .................

MB = 220 bytes, .............................kB = 210 bytes

5

SPECIFICATIONS

1. SYSTEM REQUIREMENTS

-CPU: IBM Compatible Pentium 4 2.4GHz (or faster) (For High speed, 2.4GHz or faster recommended.) -128MB Memory or greater

2. SUPPORTING OPERATING SYSTEM

* Operating System

 

 

* Recording tool

Windows Millennium Edition (Me)

 

 

(1)

Nero(Ahead)

Window 2000 Professional

 

 

(2)

In CD(Ahead)

Window XP Home Edition, Professional

 

(3) Power Producer Gold (Cyber Link)

2.1 Applicable disc formats

 

 

 

 

DVD ............................

DVD-ROM:

4.7GB (Single Layer)

 

 

 

8.5GB (Dual Layer)

 

DVD-R DL:

8.5GB

 

DVD-R:

 

4.7GB (Ver.2.0 for Authoring : read only)

 

 

 

4.7GB (Ver.2.0 for General: read & write)

 

DVD-RW:

4.7GB (Ver.1.2)

 

DVD-RAM:

2.6GB/side (Ver.1.0)

 

 

 

1.46GB/side, 4.7GB/side (Ver.2.2)

 

DVD+R:

 

4.7GB

 

DVD+R DL:

8.5GB

 

DVD+RW:

4.7GB

CD...............................

CD-ROM Mode-1 data disc

 

CD-ROM Mode-2 data disc

 

CD-ROM XA, CD-I, Photo-CD Multi-Session, Video CD

 

CD-Audio Disc

 

 

Mixed mode CD-ROM disc (data and audio)

 

CD-Extra

 

 

 

CD-Text

 

 

 

 

CD-R (Conforming to “Orange Book Part2”: read & write)

 

CD-RW (Conforming to “Orange Book Part3”: read & write)

2.2 Writing method

 

 

 

 

(1) DVD-R/RW ...........................

 

Disc at Once

 

 

Incremental Recording

 

 

Restricted Overwrite (DVD-RW only)

(2) DVD-R DL ............................

 

Disc at Once

 

 

Incremental Recording

 

 

Layer jump Recording

(3) DVD-RAM/+RW ...................

 

Random Write

(4) DVD+R .................................

 

Sequential Recording

(5) DVD+R DL ...........................

 

Sequential Recording

(6) CD-R/RW .............................

 

Disc at Once (DAO)

 

 

Session at Once (SAO)

 

 

Track at Once (TAO)

 

 

Packet Write

2.3 Disc diameter ..............................................

 

120mm

 

 

 

80mm (Horizontal only)

6

2.4 Data capacity

 

• User Data/Block DVD-ROM/R/RW/RAM/+R/+RW ......

2,048 bytes/block

CD (Yellow Book) ..........................................

2,048 bytes/block(Mode 1 & Mode 2 Form 1)

 

2,336 bytes/block (Mode 2)

 

2,328 bytes/block (Mode 2 Form 2)

 

2,352 bytes/block (CD-DA)

2.5 RPC (Regional Playback Control) Phase2, No Region

3.DRIVE PERFORMANCE

3.1 Host interface ..................................................................

 

X3T13 ATA/ATAPI5/1321D

 

 

 

INF-8090i Rev.5.3

3.2 Read/Write & Rotational speed

 

 

 

 

 

<Write>

DVD-R ...............................................................

 

2x, 4x(CLV), 8x(ZCLV), 16x(PCAV)

 

DVD-R DL .........................................................

 

2x, 4x(CLV)

 

DVD-RW............................................................

 

1x, 2x, 4x, 6x(CLV)

 

DVD-RAM ...............................

Ver. 2.2 .............

2x, 3x(ZCLV), 3x-5x(PCAV)

 

DVD+R ..............................................................

 

2.4x, 4x(CLV), 8x, 12x, 16x(PCAV)

 

DVD+R DL ........................................................

 

2.4x, 4x, 6x(CLV)

 

DVD+RW...........................................................

 

2.4x, 4x(CLV), 8x(ZCLV)

 

CD-R .................................................................

 

4x, 8x, 16x(CLV), 24x, 32x, 40x, 48x(ZCLV)

 

CD-RW ..............................................................

 

4x, 10x,16x(CLV), 24x, 32x (ZCLV)

 

 

 

(High Speed: 10x, Ultra Speed: 16x, 24x, 32x)

<Read>

DVD-ROM...............................

Single layer.......

6.7x

- 16x

(CAV), Approx. 9,420 r/min

 

................................................

Dual layer .........

5.0x

- 12x

(CAV), Approx. 7,770 r/min

 

DVD-R DL ...............................

8.5GB ...............

3.3x

-

8x

(CAV), Approx 5,180r/min

 

DVD-Video (CSS) .............................................

 

3.3x

-

8x

(CAV), Approx. 5,180 r/min

 

DVD-R.....................................

4.7GB ...............

4.2x

- 10x

(CAV), Approx. 5,890 r/min

 

DVD-RW .................................

4.7GB ...............

3.3x

-

8x

(CAV), Approx. 4,720 r/min

 

DVD-RAM ...............................

Ver. 1.0/ 2.2 ......

2x/ 2x, 3x (ZCLV)* 3x-5x (PCAV)*

 

DVD+R....................................

4.7GB ...............

4.2x

- 10x

(CAV), Approx. 5,890 r/min

 

DVD+R DL ..............................

8.5GB ...............

3.3x

- 8x (CAV), Approx. 5,180 r/min

 

DVD+RW ................................

4.7GB ...............

3.3x

-

8x

(CAV), Approx. 4,720 r/min

 

CD-R/ROM, CD-I / Video ........

(1.2m/s) ............

20x - 48x

(CAV), Approx. 9,540 r/min

 

CD-RW ...................................

(1.2m/s) ...........

16.7x -

40x (CAV), Approx. 8,100 r/min

 

CD-DA (DAE)..........................

(1.2m/s) ...........

16.7x -

40x (CAV), Approx. 8,100 r/min

 

CD-DA (Audio out) ..................

(1.2m/s) ...........

4.0x

- 10x

(CAV), Approx. 2,030 r/min

* Rotational speed (CLV, ZCLV)

 

 

 

 

 

 

DVD-R/RW/ROM, +R/RW ...............................

 

1x: Approx. 1,390(Inside) - 580 r/min(Outside)

 

DVD-RAM................................

Ver. 1.0 ...........

1x: Approx. 2,390(Inside) - 1,010 r/min(Outside)

 

 

Ver. 2.2 ...........

2x: Approx. 3,250(Inside) - 1,380 r/min(Outside)

 

CD-R/RW/ROM ...............................................

 

1x: Approx. 500(Inside) - 210 r/min(Outside)

7

3.3Data transfer rate

3.3.1Sustained transfer rate

<Write> DVD-R.........................

2.77, 5.54, 5.44-11.08 Mbytes/s..................................

2x, 4xCLV, 8x ZCLV

 

9.14-22.16 Mbytes/s....................................................................

16x

PCAV

DVD-R DL ...................

2.77, 5.54 Mbytes/s....................................................................

2x, 4x

CLV

DVD-RW ...............

1.385, 2.77, 5.54, 8.31 Mbytes/s ...................................

1x, 2x, 4x, 6x

CLV

DVD-RAM (Ver.2.2): ...

2.77, 4.15, 4.15-6.925 Mbytes/s (w/o Verify) .......

2x, 3x ZCLV, 3-5x

PCAV

DVD+R ........................

3.32, 5.54, 8.31-11.08 Mbytes/s..............................

2.4x, 4x CLV, 8x ZCLV

 

8.31-16.62, 9.14-22.16 Mbytes/s ..............................

12x ZCLV, 16x

PCAV

DVD+R DL ..................

3.32, 5.54, 8.31 Mbytes/s ..................................................

2.4x, 4x, 6x

CLV

DVD+RW.....................

3.32, 5.54, 8.31-11.08 Mbytes/s .............................

2.4x, 4x CLV, 8x ZCAV

CD-R ...........................

600, 1,200, 2,400, 2,400-3,600, 2,400-4,800, 2,400-6,000, 2,400-7,200 kB/s (Mode-1)

 

..........................................

 

4x, 8x, 16x CLV 24x, 32x, 40x, 48x ZCLV

CD-RW........................

600, 1500, 2,400, 2,400- 3,600, 2,400-4,800 kB/s (Mode-1)

 

..........................................

 

4x, 10x, 16x CLV, 24x, 32x ZCLV

<Read> DVD-ROM ...................

Single layer ....

9.28

- 22.16 Mbytes/s ...........................................

16x max.

....................................

Dual layer.......

6.86

- 16.62 Mbytes/s ...........................................

12x max.

DVD-R ................................................

 

5.73

- 13.85 Mbytes/s ............................................

10x max.

DVD-R DL...........................................

 

4.58

- 11.08 Mbytes/s ..............................................

8x max.

DVD-RW .............................................

 

4.58

- 11.08 Mbytes/s .............................................

8x max.

DVD-RAM ...................

Ver. 1.0 ..........

2.77

Mbytes/s .........................................................

2x ZCLV

....................................

Ver. 2.2 ..........

2.77, 4.155,4.155-6.93 Mbytes/s ..

2x, 3x ZCLV, 3-5x PCAV

DVD+R ...............................................

 

5.73

- 13.85 Mbytes/s ............................................

10x max.

DVD+R DL..........................................

 

4.58

- 11.08 Mbytes/s ..............................................

8x max.

DVD+RW ............................................

 

4.58

- 11.08 Mbytes/s .............................................

8x max.

CD-R/ROM .........................................

 

3,000 - 7,200 kB/s..................................................

48x max.

CD-RW........................

......................

2,500 - 6,000 kB/s..................................................

40x max.

CD-DA (DAE)......................................

 

2,500 - 6,000 kB/s..................................................

40x max.

3.3.2 Burst transfer rate

 

 

 

 

Ultra DMA Mode 2 ..............................

 

33.3

Mbytes/s max.

 

Multiword DMA Mode 2 ......................

16.6

Mbytes/s max.

 

PIO Mode 4 ........................................

 

16.6

Mbytes/s max.

 

3.4 Access time (1/3 stroke)

 

 

 

 

DVD-ROM...........................................

 

145 ms Typ.* (Note 1)

 

DVD-RAM (Ver.2.2) ............................

 

165 ms Typ.

 

CD-ROM .............................................

 

125ms Typ. (Note 1)

 

Note :

1) Average random access time is the typcal value of more than 50 times including latency and error correction time.

Test Disc : DVD : ALMEDIO TDV-520 / TDR-820

CD : ALMEDIO TCDR-701 / HITACHI HCD-1

*) Typical value defines a measured value in normal temperature (20 deg.C.) and horizontal position.

3.5

Data error rate (Measured with 5 retries maximum)

 

 

DVD-R/RW/ROM/RAM ..................................

<10-12

 

DVD+R/+RW..................................................

<10-12

 

CD-R/RW/ROM..............................................

<10-12 (Mode-1)

 

 

<10-9 (Mode-2)

 

Condition : It is assumed that the worst case raw error rate of the disc is 10-3

3.6

Data buffer capacity .......................................................

2 Mbytes

8

4. Quality and Reliability

4.1 MTBF..................................................

100,000 Power On Hours(Consecutive/Cumulative POH)

 

Assumption : ..........................

Used in a normall office environment at room temperature.

 

-POH per year.........................

3,000

 

-ON/OFF cycles per year........

600

 

-Operating duty cycle..............

20% of power on time (Seek: 5% of operating time)

4.2

Tray cycle test...................................

30,000 times

 

 

No degeneration in the mechanical part after test

4.3

Actuator mechanism ........................

1,000,000 full stroke seek

4.4 MTTR (Mean Time To Repair) ...........

0.5 h

4.5

Component life .................................

5 years or 2,000 h of Laser radiating time

 

Assumption : ..........................

Used in a normall office environment.

5.POWER REQUIREMENTS

5.1 Source voltage

+5V

+ 5% tolerance, less than 100 mVp-p Ripple voltage

 

 

+12V

+ 10% tolerance, less than 100 mVp-p Ripple voltage

 

5.2 Current

 

 

 

 

Idle (Hold track state)..............

+5V DC .................

0.9A typ. .........

< 1.0 A max.

 

 

+12V DC ...............

0.5A typ...........

< 1.0 A max.

 

Write (Active) ..........................

+5V DC .................

1.3A typ. .........

< 1.5 A max.

 

 

+12V DC................

0.9A typ. .........

< 1.5 A max.

 

Read (Active) ..........................

+5V DC .................

1.0A typ. .........

< 1.5 A max.

 

 

+12V DC................

0.9A typ. .........

< 1.5 A max.

 

Seek (Acess) ..........................

+5V DC .................

1.0A typ. .........

< 1.5 A max.

 

 

+12V DC ...............

1.2A typ. .........

< 2.0 A max.

5.3 Standby

 

 

 

 

Sleep mode (No disc) .............

1.1 W typ.

1.3 W max.

 

6. AUDIO PERFORMANCE

Output Level (1kHz, 0dB) ........................................................

0.7 Vrms typical

Frequency Response ..............................................................

+/-3dB (20 to 20,000Hz)

Signal to Noise Ratio...............................................................

80 dB min. with IHF A and LPF 20 kHz

THD (1kHz, 0dB) .....................................................................

0.10% max. with LPF 20 kHz

Channel separation(10kHz).....................................................

65 dB min.

Condition: ................................................................................

Load inpedance : 10 kohms

7. Acoustic noise

Less than 50dB, A scale, at 0.5 m away from the drive Note : 1. Disc : Less than imbalance 0.3 x 10-4 Nm

2.Installation : Horizontal

3.Ambient temperature : Normal temperature

4.Except loading, unloading and seek

8.Dimensions

External dimensions (W x H xD) Front bezel (WxHxD)

146 x 41.3 x 165mm(without Bezel)

148 x 42 x 5 mm

9. Mass .................................................

Approx. 0.77+/-0.03 kg

*Which is not provided with Circuit Diagram of this model. Please Contact the friendly staff of LG Service Care at: Website http: //www.LGEservice.com

9

LOCATION OF CUSTOMER CONTROLS

Front Panel

Emergency Eject Hole

Disc Tray

Stop/Eject Button

Drive Activity Indicators

1. Disc tray

3.

Emergency Eject Hole

This is the tray for the disc. Place the disc on the

 

Insert a paper clip here to eject the Disc tray

ejected disc tray, then lightly push the tray (or

 

manually or when there is no power.

push the eject button) and the CD will be loaded.

4.

Drive activity indicator

 

NOTE: Don’t pull out or push in the disc tray

 

Two colored LED is used to indicate the operation

forcibly. This might cause damage to the loading

 

of the Drive.

section of the drive.

 

 

2.Stop/Eject button

This button is pressed to open the CD tray.

This button works only when power is supplied to the drive.

10

Rear Panel

Analog Audio Output Connector

 

 

 

IDE Interface Connector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Jumper Connector

Power Connector

Digital Audio Output

Connector

NOTE: The actual drive may be different from this design.

1. Power Connector

3. Jumper Connector

Connects to the power supply (5-and 12-V DC) of the host computer.

NOTE : Be careful to connect with the proper polarity. Connecting the wrong way may damage the system (and is not guaranteed). Usually this connector can only be attached one-way.

2.IDE Interface Connector

Connect to the IDE (Integrated Device Electronics) Interface using a 40-pin flat IDE cable.

NOTE : Do not connect or disconnect the cable when the power is on, as this could cause a short circuit and damage the system. Always turn the power OFF when connecting or disconnecting the cable.

This jumper determines whether the drive is configured as a master or slave. Changing the master-slave configuration takes effect after power-on reset.

4.Analog Audio Output Connector

Provides output to a sound card (analog signal). Generally you need this to play a regular audio CD.

5.Digital Audio Output Connector

This connector is not supported.

11

DISASSEMBLY

1.CABINET and CIRCUIT BOARD DISASSEMBLY

1-1. Bottom Chassis

A.Release 4 screws (A) and remove the Bottom Chassis in the direction of arrow (1). (See Fig.1-1)

(1)

 

 

(A)

 

Bottom Chassis

(A)

 

(A)

(A)

 

Fig. 1-1

1-2. Front Bezel Assy

A.Insert and press a rod in the Emergency Eject Hole and then the CD Tray will open in the direction of arrow (2).

B.Remove the Tray Door in the direction of arrow

(3) by pushing the stoppers forward.

C.Release 3 stoppers and remove the Front Bezel Assy.

 

Tray Door

(3)

 

Stoppers

 

(2)

CD Tray

 

Front Bezel Assy

Emergency Eject Hole

 

Fig. 1-2

1-3. Cabinet and Main Circuit Board

A.Remove the Cabinet in the direction of arrow (4). (See Fig. 1-3)

B.When the CD tray has been opened completely, lift 2 points (a) and remove the CD tray while drawing out simultaneously.

C.Remove the Soldering of the LDand LD+ (b) for the Loading Motor, and then remove the Main Circuit Board.

D.At this time, be careful not to damage the 4 connectors of the Main Circuit Board.

 

Cabinet

(a)

(4)

 

(5)

Main

 

Circuit Board

(b)

 

 

Fig. 1-3

2. MECHANISM ASSY DISASSEMBLY

2-1. Pick-up Unit

A.Release screws (B).

B.Separate the Pick-up Unit in the direction of arrow (6).

(B)

(B)

 

Pick-up Unit

 

 

(6)

 

Mechanism Assy

Fig. 2-1

 

12

2-2. Pick-up

A. Release 1 screw (C) and remove the Pick-up.

Pick-up Unit

(C)

Pick-up

Fig. 2-2

13

LG GSA-4167B, GSA-4168B, GSA-4165B User Manual

 

 

 

 

 

 

 

005

 

035

004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

EXPLODED VIEW

 

 

008

012

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

006

 

 

 

 

 

 

 

 

 

 

 

 

 

 

009

 

 

 

015

 

 

 

 

 

 

 

 

010

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

011

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

PBM00 (MAIN C.B.A)

 

 

 

 

 

 

 

 

016

 

 

 

 

 

 

 

 

A03

 

 

 

 

 

 

 

PBF00 (FRONT C.B.A)

 

 

 

A01

 

 

 

 

 

 

 

 

 

 

 

 

013

 

453

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

034

 

 

 

 

 

 

 

 

 

 

 

 

033

 

 

 

 

 

 

 

 

 

 

 

 

031

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

001

 

 

 

 

007

 

026

027

 

024

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

025

 

 

 

 

 

 

 

 

2

 

 

 

 

445

 

 

 

 

 

 

 

 

A02

 

 

430

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

028

 

020

 

 

 

452

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

430

028

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

481

 

 

020

 

 

 

482

 

 

 

 

 

 

 

 

 

 

 

 

 

 

003

 

 

 

 

 

 

 

 

 

 

 

 

 

 

021

 

030

 

 

 

 

 

 

 

 

002

 

 

 

 

032

 

482

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

482

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

050

 

 

452

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

014

453

 

 

452

 

 

 

482

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

036

021

 

 

 

 

 

 

 

 

 

 

 

(LightScribe only)

 

 

 

 

 

 

 

 

A

B

C

 

D

 

 

E

 

F

G

H

 

 

 

 

 

14

 

15

 

 

 

 

 

 

GLOSSARY

 

 

ATIP

Absolute Time in Pre-groove. With an additional modulation of the “Wobble”, the “Groove” contains a time

 

code information.

 

 

Wobble

The pre-groove in the Disc is not a perfect spiral but is wobbled.

 

With : – A typical amplitude of 30 nm

 

– A spatial peried of 54~64 µm

 

 

CW

Continuous Wave. The laser light output is at a constant level.

 

 

DOW

Direct Over-Write. The action in which new information is recored over previously recorded information in

 

CD-RW disc.

 

 

Overwrite

The action in which new information is recorded over previously recorded information.

 

 

(Pre-)Groove

The guidance track in which clocking and time code information is stored by means of an FM

 

modulated wobble.

 

 

Land

Land is characterized in the following way:

 

When radial signals are concerned,land is defined as the area between the grooves.

 

When HF signal are concerned,land is defined as the area between the marks(pits) in tangential

 

direction.

 

 

Hybrid Disc

A Multisession disc of which the first Session is mastered. On a hybrid disc, recorded and

 

mastered information may co-exist.

 

 

Mastered

Information,stored as pits on the disc during the manufacturing process of the disc.

Information

(when making the master)

 

 

OPC

Optimum Power Control. Procedure is determined optimum recording power according to CD-

 

R/RW Media in recording start step.

 

 

ROPC

Running OPC. The purpose is to continuously adjust the writing power to the optimum power

 

that is required.

 

When the optimum power may change because of changed conditions of disc and change in

 

operating temperature.

 

 

Jitter

The 16 value of the time variation between leading and trailing edges of a specific (I3 … I11) pit

 

or land as measured by Time Interval Analysis.

 

 

Deviation

The difference between a fixed value of Pit length and Land length.

 

 

TOC

Table Of Contents : in the Lead-in Area the subcode Q-channel contains information about the

 

Tracks on the disc.

 

 

Packet

A method of writing data on a CD in small increments.

Writing

Two kinds of packets can be written : Fixed-length and Variable-length.

Write

The shape of the HF write signal used to modulate the power of the laser.

Strategy

The Write Strategy must be used for recordings necessary for disc measurements.

 

 

Information

Wobble, ATIP, Disc Identification, Write Power, Speed Range OPC Parameters, etc are

Area

recorded in the Information area of CD-RW Disc

Finalization

The action in which (partially) unrecorded or logically erased tracks are finished and the Lead-in

 

and/or Lead-out areas are recorded or overwritten with the appropriate TOC subcode.

 

 

Logical Erase

A method to remove information from a disc area by overwriting it with an EFM signal containing

 

mode 0 subcode

 

A logically erased area is equivalent to an unrecorded

 

 

Physical Erase

The action in which previously recorded information is erased by overwriting with a CW laser

 

output.

 

After a Physical Erase action, the erased area on the CD-RW disc is in the unrecorded state

 

again.

 

 

Session

An area on the disc consisting of a Lead-in area, a Program area, a lead-out area.

Multi session

A session that contains or can contain more than one session composed Lead-in and Lead-out

19

The differences of CD-R/CD-RW discs and General CD-ROM

1. Recording Layer

Recordable CD has a wobbled pre-groove on the surface of disc for laser beam to follow track.

CD-ROMRead(READ-only-ONLYDisc DISC)

.6um

1

3~11T

0.4~0.5 um

CD-R and CD-RW Disc

(Pit)Groove

Land

 

Track pitch(p)

a=30nm

 

A

 

 

 

Iw

 

 

O

 

 

a

Radial Direction

 

 

 

 

Radial Error Signal

Land

Groove

 

 

a

 

 

 

Average center

 

 

Actual center

 

 

The Groove wobble

2. Disc Specification

ITEM

CD-ROM

CD-R

CD-RW

 

 

 

 

Standard

Yellow Book

Orange Book II

Orange Book III

 

 

 

 

Record

Not available

Write once

Re-Writeable

 

 

 

 

Tracking Signal I11/Itop

> 0.6

> 0.6

0.55 > M11> 0.70

(HF Modulation)

 

 

 

 

 

 

 

Read Laser Power(mW)

< 0.5 mW

< 0.7 mW

< 1.0 mW

 

 

 

 

Jitter

< 35 nsec

< 35 nsec

< 35 nsec

 

 

 

 

Reflectivity (Rtop)

70 %

65 %

15 % ~ 25 %

 

 

 

 

Remark) Write Laser Power(mW)

 

14-65 mW

6-45 mW

 

 

 

 

20

3. Disc Materials

1)CD-ROM disc

It is composed of Silver _ colored aluminum plate and Reflective layer.

Groove (Pit) of aluminum plate make a track.

Laser wavelength : 780 nm, Laser Power (Read): 0.5mW

Signal is detected by the difference of reflective beam

intensity between “pit” and “Land” on the disc.

Label Printing

Protective Layer

Reflective Layer

Substrate (Polycarbonate)

Pit

Laser Beam

2)CD-R disc

It is so-called WORM (Write Once Read Many) CD.

It is composed of polycarbonate layer, Organic dye layer, Reflective layer, and Protective layer.Gold/Silver Reflective layer is used to enhance the reflectivity

According to the kinds of Organic dye layer, it is divided by Green CD, Gold CD, Blue CD.

Laser Wavelength : 780 nm, Laser Power (read) : 0.7 mW

Recording Power : 8x(14~20mW), 16x(25~35mW)

When some part of dye layer is exposed to laser heat, it’s color changs black.Therefore, writing and reading is enabled by the difference of reflectivity between changed part and unchanged part.

Polycarbonate layer has Pre_Groove which make a Track.

 

Pigment

Reflective Layer

Color

 

 

 

 

 

Phtalocyanine

Gold/Silver

Yellow/White

 

 

 

 

 

Cyanine

Gold/Silver

Dark Green/Bright Green

 

 

 

 

 

Azo

Gold/Silver

Dark Blue

 

 

 

 

 

 

 

 

 

 

 

 

Label Printing

Protective Layer

Reflective Layer

Organic Dye Layer

Substrate (Polycarbonate)

Laser Beam

Groove

21

3) CD-RW Disc

Label Printing

Protective Layer

Dielectric Layer(TL)

Recording Layer

Dielectric Layer(UL)

Substrate (Polycarbonate)

Laser Beam

Groove

It is composed of polycarbonate layer, alloy(silver, arsenic) layer, aluminum reflectivity layer, protective layer.

An crystalized alloy layer is transformed into noncrystalized by the laser heat. Therefore, writing and reading is enabled by the difference of reflectivity.

It is possible to overwrite about 1000 times.

Laser Wavelength : 780 nm, Laser Power (Read) : 1.0mW

Recording Power : Erase (4~18mW), Write (6~45mW)

When disc rewriting, new data is overwritten previously recorded data.

Polycarbonate layer has a Pre-Groove which make a track.

4. Reading process of Optical Disc

 

 

Lens

H

 

 

 

θ

D

 

 

 

 

Beam

 

 

Spot

Focusing

Numerical aperture:

NA=nsinθ,

Lens

 

n: Refractive index

 

Focus depth : H = λ/NA

Laser Spot

laser spot diameter : D = λ/NA2

 

 

at Constant

 

 

Read Intensity

Previously Recorded Marks

 

 

 

Groove

Land

Mirror

Reflected

 

 

 

 

Light

 

 

 

 

Signal

 

 

 

 

 

I11

IG

IL

I0

I3

Itop Laser Spot

 

 

 

Position

 

 

(Time)

22

5. Writing Process of CD-R Disc

Incident

(Write)

 

Laser

 

 

 

Power

 

(Read)

(Read)

 

a

b c d e f g

Laser Spot

Position

 

 

(Time)

 

a

 

Laser

b

 

Spot

 

Reflected

 

c

 

Light

 

 

Signal

 

d

 

 

e

 

 

f

 

Recorded

 

g

Mark

 

 

 

Reflected

Light

Signal

 

 

 

 

 

 

 

 

 

Laser Spot

 

 

 

 

 

 

 

 

 

a b c d e f

g

Position

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Time)

Below "ORP"– Mark Too Short

At Optimum Record Power ("ORP")

Above "ORP" – Mark Too Long

Time

6. Writing process of CD-RW Disc

Crystal phase

Amorphous

Write Power

 

 

 

 

 

 

 

 

 

 

Melting/

 

 

 

 

 

 

 

quenching

 

Erase Power

 

 

 

 

 

 

 

 

 

 

Heating/

 

Read Power

 

 

 

 

gradual cooling

 

 

 

 

 

 

 

Erased state

Recorded state

 

 

 

 

 

 

(higher reflectivity)

(lower reflectivity)

Groove

 

 

 

 

 

Crystal Amorphous

23

7. Organization of the PCA, PMA and Lead-in Area

1) Layout of CD-ROM disc

Disc Center

Diameter 120 mm

 

Diameter 46 mm

Diameter 15 mm

Center hole

Clamping and Label Area

 

Information Area

 

 

 

 

 

 

Read Only Disc

 

 

 

 

 

 

Lead-in Area

Program Area

 

Lead-out Area

 

 

 

 

 

 

 

 

 

 

2) Layout of CD-R/RW disc

Disc Center

Diameter 120 mm

 

 

 

Diameter 45 mm

Diameter 15 mm

 

Center hole

Clamping and Label Area

 

 

 

Information Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unrecorded Disc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCA

PMA

 

Lead-in Area

 

 

 

Program Area

Lead-out Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test Area : for performing OPC procedures.

 

Test Area

 

Count Area

 

 

 

 

 

 

 

Count Area : to find the usable area immediately in T.A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tsl : start time of the Lead-in Area, as encoded in ATIP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in

 

 

 

 

 

 

 

 

 

 

 

 

out

PMA : Program Memory Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tsl-00:35:65 Tsl-00:15:05 Tsl-00:13:25 Tsl

99:59:74

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00:00:00

 

 

 

 

24

8. Function of PCA and PMA area

1)PCA (Power Calibration Area)

PCA area is used to determine the correct Laser Power for a disc.

Method 1 : PCA area is divided by a track.

Method 2 : The previous Calibration value is referred.

Method 3 : ROPC is used to determine Laser Power value automatically in data writing.

CD-R Disc can write maximum 99 Tracks but CD-RW Disc can write unlimited tracks because it has a rewritable function.

2)PMA (Program Memory Area)

It has a track information (track No, track Start/End time) of every track before writing completed.

PMA area has the last written point and the next writable point of a disc.

In case of CD to CD copy, some writer may not write PMA area.

* When Disc is Finalized,

PMA information is transferred to the Lead_In area so that general Driver can read it.

* Because PCA and PMA area exist before Lead-In area, General CD Player or CD-ROM Drive can’t read these areas.

9. OPC and ROPC

1)OPC (Optimum Power Control)

This is the first step of writing process, because CD writer has its own laser power value and media have different writing characteristics,

This is determined by the Writing characteristic, speed, temperature, and humidity.

Laser wavelength is determined by the environmental temperature (775~795nm) and Optical Laser Power is determined by the test and retry.

Asymmetry and optimum writing Power

EFM signal Asymmetry is determined by the writing power.

Therefore, Optical Power which has the same value to the preset power value can be estimated by measuring HF signal Asymmetry on the PCA area.

Measurement of Asymmetry

*Parameter setting (Beta) : Using AC coupled HF signal before equalization Beta = (A1+A2)/(A1-A2)

Signal

A1

 

0

 

HF

 

 

 

 

A2

 

 

Time

P << Po

P = Po

Time

P >> Po

Time

25

Reflected recording pulse
Incident recording pulse

2) ROPC (Running Optimum Power Control)

• Variable primary factor of Optimum Power

Change of Power sensitivity on the Disc. (limited to 0.05 *Po)

Wavelength shift of the laser diode due to the operating temperature change.

Change of the Spot aberration due to the Disc skew,

Substrate thickness, Defocus.

– Change of Disc or Optics conditions due to the long term OPC

==> It is necessary to adjust continuously to obtain the Optimum Power.

• Principle of Running OPC

Sampled timing B

– To meet the factors mentioned above,

 

 

a horizontal _ direction movement of a curve is uesd.

 

 

– Beta = f(B-level) = constant on the Recorded Disc

Procedure of ROPC

a. Reference B-level is determined during OPC Procedure.

b. During Recording, B-level value is controlled to have a close Reference B-level value.

c.Normalization of B-level is used to eliminate the effect of reflectivity fluctuation. ==> The reflected B-level value is normalized by the disc reflectivity itself.

 

B

Sample Disc Reflectivity

Level

 

(Read power)

 

11T

Sample B-level (Write Power)

Sampled at timing B normalized to recording power

Level B with Pwo

Pwo decided by OPC

Recording Power

10. Writing Process of DISC

 

 

 

CD-R/RW Media

Program Area

 

 

Write Strategy

PMA Area

ROPC

 

Determination

 

 

 

 

 

OPC

PCA Test Area

Lead-In Area

 

 

 

PCA Count Area

Lead-out Area

* Recording Capacity of CD-R/RW (74Minute Recording media)

(2048 Byte/Sector) X (75 Sector/Second) X (60 Second/Minute) X 74 Minute = 681,984,000 Bytes = 682 Mbytes

But the actual recording capacity is about 650 Mbytes. (according to the ISO 9660 standard, approximately 30 Mbytes are used to make directory structure and volume names.)

26

The differences of DVD-R/RW, DVD+R/RW discs and DVD-ROM

1. Recording Layer

DVD-ROM (Read Only Disc)

um

.74

0

T

3

0.4 um

DVD-R/RW Disc

LPP

(Land Pre-Pit)

DVD+R/RW Disc

27

2. Disc Specification

 

DVD-ROM

DVD-R

DVD-RW

DVD+R

DVD+RW

 

 

 

 

Single-Layer

Dual-Layer

 

 

 

 

 

 

 

 

 

 

 

 

Media Type

Read Only

Read Only

Dye

Phase change

Dye

Phase change

 

 

 

 

 

 

 

User data capacity

4.7GB

8.54GB

4.7GB

4.7GB

4.7GB

4.7GB

 

 

 

 

 

 

 

Wavelength

650nm

650nm

650nm

650nm

650nm

650nm

 

 

 

 

 

 

 

Reflectivity

45~85%

18~30nm

45~85%

18~30%

45~85%

18~30nm

 

 

 

 

 

 

 

Track pitch

0.74

0.74

0.74

0.74

0.74

0.74

 

 

 

 

 

 

 

Minimum pit length

0.4

0.44

0.4

0.4

0.4

0.4

 

 

 

 

 

 

 

Modulation

>0.6

>0.6

>0.6

>0.6

>0.6

>0.6

 

 

 

 

 

 

 

Channel bitrate

26.16MHz

26.16MHz

26.16MHz

26.16MHz

26.16MHz

26.16MHz

 

 

 

 

 

 

 

Wobble Frequency

-

-

140KHz

140KHz

817.4KHz

817.4KHz

 

 

 

 

 

 

 

Addressing

26.16MHz

26.16MHz

Wobble & LPP

Wobble & LPP

Wobble(ADIP)

Wobble(ADIP)

 

 

 

 

 

 

 

Read Power (mW)

 

 

 

 

0.7 + 0.1

0.7 + 0.1

 

 

 

 

 

 

 

Write Power (mW)

-

-

 

 

 

 

 

 

 

 

 

 

 

JItter

<8%

<8%

<8%

<8%

<9%

<9%

 

 

 

 

 

 

 

3. Disc Materials

1) DVD-ROM

<Single Layer >

Label

Polycarbonate

Bonding layer

Reflective layer

Polycarbonate

<Dual Layer >

Label

Polycarbonate

Reflective layer

Bonding layer

Semi-reflective

Polycarbonate

28

2) Recording format using organic dye material (DVD-R/DVD+R)

*The format that records data through the creation of recorded marks by changing the organic dye material with a laser beam.

> Disc structure

DVD-R

DVD+R

Adhesive layer

Adhesive layer

Protective layer

Protective layer

Reflective layer

Reflective layer

Recording layer(dye)

Recording layer(dye)

Disc substrate

Disc substrate

> Disc structure

[Recording]

Recording is done by changing the organic dye layer and the substrate with a laser when a strong is applied to a disc, the temperature of the ortanic dye material goes up, the dye is decomposed and the substrate changes at the same time. At this time, a durable bit is created as is the case with a CD-ROM.

[Playback]

Signals are read with the differences of the reflection of a laser from pits.

Adhesive layer

Protective layer

Reflective layer

Dye layer

Substrate

Laser beam

29

3) Recording format using phase-change recording material (DVD-RW/DVD+RW)

*Data is recorded by changing the recording layer from the amorphous status to the crystalline status, and played back by reading the difference of the reflection coefficient.

[ Amorphous : Non-crystalline ]

> Disc structure

DVD-RW

DVD+RW

Adhesive layer

Adhesive layer

Protective layer

Protective layer

Reflective layer

Reflective layer

Dielectric layer

Dielectric layer

Recording layer

Recording layer

(Phase change material)

(Phase change material)

Dielectric layer

Dielectric layer

Disc substrate

Disc substrate

> Recording principles

[Recording]

When a high-power laser is applied to the recording material, it melts and then becomes amorphous with a low reflection coefficient when it quickly cools off. When a mid-power laser is applied to heat gradually the recording material and then gradually cools it off, it becomes crystal with a high reflection coefficient.

[Playback]

A low-power laser is used for playback. The amount of reflected light depends on the status (amorphous or crystalline) of the recording material. This is detected by an optical sensor.

Substrate

Laser beam

Crystalline status

Amorphous status

Recording data (Melting/Quick cooling)

Erasing data (Heating/Gradual cooling)

Data erased state

Recorded state

(High reflection coefficient)

(Low reflection coefficient)

30

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