| (1) Short LD Wavelength & High Objective Lens' NA | ->Wavelength=680 nm,NA=0.55 |
| (2) Narrow Track Pitch | -> 0.85microm |
| (3) High Bit Density | -> 0.40microm/bit |
| (4) From Land recording to Groove recording | -> to keep high C/N under high data density |
| (5) New Format type of 2048 Bytes/sector |
Technical Comparison Table for Drive & Disk
|
|
1st 650 GBytes |
2nd 1.3 GBytes |
3rd 2.6 GBytes |
4th 5.2 GBytes |
|
Laser Wavelength |
780nm |
780nm |
680nm |
680nm |
|
NA |
0.5 |
0.55 |
0.55 |
0.55 |
|
Track Pitch |
1.60microm |
1.39microm |
1.15microm |
0.85microm |
|
Bit Length |
1.02microm |
0.86microm |
0.50microm |
0.40microm |
|
Modulation Method |
RLL(2,7) |
RLL(2,7) |
RLL(1,7) |
RLL(1,7) |
|
Recording Method |
PPM |
PPM |
PWM |
PWM* |
|
Land/Groove |
Land |
Land |
Land |
Groove |
|
ZCAV |
X |
O |
O |
O |
|
Sector Size |
1K/512 |
1K/512 |
1K/512 |
2K/1K/512 |
|
Outer Radius |
to 60mm |
to 60mm |
to 60mm |
to 62mm |
|
PRML** |
X |
X |
X |
O |
*PWM:Pulse
Width Modulation
**PRML:Partial
Response Maximum likelihood
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 |
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