ultra density optical (UDO)
Ultra Density Optical (UDO) is an optical storage technology designed to replace magneto-optical(MO) storage. Developed by Hewlett Packard, Sony and Plasmon, UDO technology offers storage capacities of 14 gigabytes( GB), 30 GB, 60 GB, 120 GB and 240 GB and data transfer rates of 8 MB/s, 12 MB/s and 18 MB/s on a 130-mm disk. These storage capacities and transfer rates enable the use of UDO technology in all commercial sectors, in data archiving and video technology for HDTV storage.
Like the Blu-Ray disc, UDO technology uses short-wavelength blue-violet laser light with a wavelength of 405 nm and with a numerical aperture( NA) of 0.70 or 0.85, and as with the DVD, the data is written in a phase-change process into a layer that is only 100 µm thin. The short-wavelength light allows the density of pits and lands to be significantly increased compared to longer-wavelength light. Storage density ranges from 1.15 GB/cm2 to 4.65 GB/cm2.
The sectors of the UDO disc are 8 kilobytes( KB) in size, and the blocks for error correction( ECC) are exactly the same size. UDO discs are available in three versions: as "True Write Once" for writing once and with erase protection, as "Compliant Write Once" with erase function and as "Rewritable" (UDO- RW), which can be written and erased 10,000 times.
The UDO drive was developed with the highest precision and features a Mean Swaps Between Failure( MSBF) of 750,000, making it suitable for backups in jukeboxes. Other formats competing with the UDO disc are the HD-DVD, the Professional Disc for Data( PDD) and the Enhanced Versatile Disc( EVD).