Updating laser in xbox disk drive
For rewritable CD-RW, DVD-RW, DVD RW, DVD-RAM, or BD-RE media, the laser is used to melt a crystalline metal alloy in the recording layer of the disc.Depending on the amount of power applied, the substance may be allowed to melt back (change the phase back) into crystalline form or left in an amorphous form, enabling marks of varying reflectivity to be created.Because the depth of the pits is approximately one-quarter to one-sixth of the laser's wavelength, the reflected beam's phase is shifted in relation to the incoming beam, causing mutual destructive interference and reducing the reflected beam's intensity.This is detected by photodiodes that create corresponding electrical signals.Compact discs, DVDs, and Blu-ray discs are common types of optical media which can be read and recorded by such drives.
USB flash drives, high-capacity, small, and inexpensive, are suitable where read/write capability is required.
Optical disc drives are an integral part of standalone appliances such as CD players, DVD players, Blu-ray disc players, DVD recorders, certain desktop video game consoles, such as Sony Play Station 4, Microsoft Xbox One, Nintendo Wii U, and Sony Play Station 3, and certain portable video game consoles, such as Sony Play Station Portable.
They are also very commonly used in computers to read software and consumer media distributed on disc, and to record discs for archival and data exchange purposes.
Double-sided media may be used, but they are not easily accessed with a standard drive, as they must be physically turned over to access the data on the other side.
Double layer (DL) media have two independent data layers separated by a semi-reflective layer.