Composites used may include BiN, Ge 3N 4, and Pd-doped tellurium suboxide. Sony, for example, uses an inorganic composite that splits into two laminar components with low reflectivity.
"Normal" BD-R discs use a composite (or, in the case of BD-RE, a phase-changing alloy) that decreases its reflectivity on recording, i.e. The information below describes the different types of recording layers that may be used on BD-R and BD-RE discs.
The calibration is necessary to allow for slight manufacturing defects, greatly reducing or completely eliminating rejected discs and drives, reducing costs and eliminating potential waste. īD-R has an Optimum Power Calibrations (OPC) / Test Zone, which is used to calibrate (finely adjust) the power of the writing laser before and during writing, and it also has a Drive Calibration Zone (DCZ) at the outer edge of the disc, for optional high speed calibration. Instead of the pits and lands found on prepressed/prerecorded/replicated discs, BD-R and RE discs contain grooves which contain a wobble frequency that is used to locate the position of the reading or writing laser on the disc.
#EXTERNAL BLU RAY READER WRITER AMAZON VERIFICATION#
Note: Add extra time for disc verification phase and time for erasing the disc in the case of BD-RE.Īs of April 2018 (approximate pricing): Since BD-RE 5.0/BD-R 4.0, a read speed of 4× is mandatory for UHD support. "Professional Device" added to BD product categories Īs of December 2017, the following speeds are seen in Blu-Ray specifications for R/RE discs: Drive speedġ00GB BR-R(E) XL TL (~33GB/layer) write timeĢ× speeds are mandatory for all formats, with 4× and 6× being optional for non-XL BD-R media.
0 kommentar(er)
