Sony Global - Gigabyte Communication Sony 5-25"MO Drive

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(1) Short LD Wavelength & High Objective Lens' NA	>>Wavelength=660 nm, NA=0.575
(2) Narrow Track Pitch	>>0.65micron
(3) High Bit Density	>>0.30micron/bit
(4) Land&Groove recording
(5) MSR Technology
(6) New Sector Format (4K Bytes/sector)

Technical Comparison Table for Drive & Disk

1st
Generation
650 GBytes

2nd
Generation
1.3 GBytes

3rd
Generation
2.6 GBytes

4th
Generation
5.2 GBytes

5th
Generation
9.1 GBytes

Laser
Wavelength

780nm

780nm

680nm

680nm

660nm

NA

0.5

0.55

0.55

0.55

0.575

Track Pitch

1.60micron

1.39micron

1.15micron

0.85micron

0.65micron

Bit Length

1.02micron

0.86micron

0.50micron

0.40micron

0.30micron

Modulation
Method

RLL(2,7)

RLL(2,7)

RLL(1,7)

RLL(1,7)

RLL(1,7)

Recording
Method

PPM

PPM

PWM

PWM

PWM*

Land/Groove

Land

Land

Land

Groove

Land & Groove

ZCAV

Sector Size

1K/512

1K/512

1K/512

2K/1K/512

**

4K/2K/1K/512

Outer
Radius

to 60mm

to 60mm

to 60mm

to 62mm

to 62.5mm

PRML***

*	PWM:Pulse Width Modulation
**	1K/512 are software emulation based on 4096 Bytes/sector
***	PRML:Partial Response Maximum likelihood