Magneto-optical Comparison
The table below summarizes the differences between conventional Magneto-Optical specifications and those of the enhanced Ultra Density Optical disc.
| Disc | 5.25-inch UDO Rewriteable | 5.25-inch UDO Write Once | 5.25-inch MO system (9.1 GB) |
|---|---|---|---|
| Disc diameter | 130 mm | 130 mm | 130 mm |
| Disc thickness | 2.4 mm | 2.4 mm | 2.4 mm |
| Cartridge size | Same as ISO 130 mm (135 x 153 x 11 mm) | Same as ISO 130 mm (135 x 153 x 11 mm) | ISO 130 mm (135 x 153 x 11 mm) |
| Number of physical tracks | 96,964 | 96,964 | 49,728 |
| Sector size | 8 kB | 8 kB | 4 kB |
| Number of sectors | 2,504,407 | 2,504,407 | 1,118,880 |
| Data area | 29.0-61.0 mm | 29.0-61.0 mm | 29.7-62.5 mm |
| Laser wavelength | Violet (405 nm) | Violet (405 nm) | 660 nm |
| Objective lens (NA) | 0.85 | 0.85 | 0.575 |
| Recording layer | Phase change | Phase change | Magneto-optical |
| Recording format | Land & groove | Land & groove | Land & groove |
| Recording side | Both sides | Both sides | Both sides |
| Track pitch | 0.33 µm | 0.33 µm | 0.65 µm |
| Minimum bit length | 0.13 µm | 0.13 µm | 0.3 µm |
| Recording density | 15.0 Gb/in² | 15.0 Gb/in² | 3.3 Gb/in² |
| Transfer rate | 4-8 MB/s | 4-8 MB/s | 3-6 MB/s |
| Error correction | LDC | LDC | LDC |
| Modulation | RLL (1,7) | RLL (1,7) | RLL (1,7) |
Read more about this topic: Ultra Density Optical
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