![]() ![]() ![]() This reflects to a so-called pinhole with a light detector behind it. Laser light is shone at a spot on a rotating disk track, focussed to the right depth for the desired layer, and then the reflected light collected via a dichroic mirror. Once written the data is unalterable - these are WORM (Write Once Read Many) disks.ĭata is read using a confocal imaging technique as in the diagram below. The laser light is focused at the right depth in the polymer film to impact a specific layer by passing through a moveable objective lens. Data is written in each layer by using a pulsed laser to cause fluorescent photobleaching such that a spot on the layer, a few hundred nanometres in size, is either light (bleached) or dark. There can be, in theory, 64 or more layers. ![]() A final die unit takes the multi-layered plastic flow of film and spreads and thins it into a long ribbon from which disc-sized circles can be cut and affixed (laminated) to platters. The polymer film is made in a co-extrusion process with a sequence of splitter/multiplier units, taking a two-layer extruded plastic flow (data layer + buffer layer) at the start and doubling its layer count each time.Ī YouTube video shows the process. The layers contain fluorescent dye-doped material and are separated by transparent buffer zones. Remember InPhase, which crashed and burned in 2010? Can Folio Photonics finally develop an optical disk to blow tape out of the archive water? TechnologyįP’s DataFilm Disk (DFD) technology uses optical disk platters, like Blu-ray, and coats them with a multiple-layered polymer film - a 3-D approach. Many companies have tried - and failed - to create an optical disk with tape-level economics and capacity. It reckons its technology is simpler to productise than holographic drives and more cost-effective and capacious than Sony’s Optical Disk Archive (cartridge with 11x 550GB disks). Folio Photonics aims to develop an archive optical disk with lower-than-tape cost, terabyte-class capacity, multi-decade life and backwards compatibility through technology generations. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |