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Disc quality: optical disc recorders detect the available speed options based on the data which is available on the disc itself. However, some low-quality discs make a high-speed option available to the software, while the burning process can never reach that speed in practice. The reading and writing process may not happen at a steady speed.
Unlike early CD-ROM drives, optical disc recorder drives have generally used industry standard connection protocols. Early computer-based CD recorders were generally connected by way of SCSI ; however, as SCSI was abandoned by its most significant users (particularly Apple Computer ), it became an expensive option for most computer users.
Some optical drives additionally throttle the reading speed based on the contents of optical discs, such as max. 40× CAV (constant angular velocity) for the Digital Audio Extraction (“DAE”) of Audio CD tracks, [32] 16× CAV for Video CD contents [33] and even lower limitations on earlier models such as 4× CLV (constant linear velocity ...
The minimum speed at which a Blu-ray Disc can be written is 36 megabits (4.5 megabytes) per second. [ 4 ] As of 2024, one of the primary pioneers of the Blu-ray disc, Sony, is winding down production of recordable Blu-ray discs in its plant in Tagajo, Japan.
In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs. A drive or disc operating in CAV mode maintains a constant angular velocity , contrasted with a constant linear velocity (CLV).
It uses the Disc-At-Once method, usually at 1x, but some recorders allow for 4x and 8x speed mode. Since the pits and lands are longer, the quantity of information that can fit on a disc is less than with a normal method: 63 minutes instead of 74 minutes on a 650MB CD or 68 min instead 80 minutes on a 700MB CD.
Blu-ray Disc recordable" (BD-R) refers to two optical disc formats that can be recorded with an optical disc recorder. BD-Rs can be written to once, whereas Blu-ray Disc Recordable Erasable (BD-REs) can be erased and re-recorded multiple times. The current practical maximum speed for Blu-ray Discs is about 12× (54 MB/s).
Comparison of the high-definition optical media formats DVD included for comparison Mandatory codecs must be supported by the player. Each disc must use one or more of the mandatory codecs. Ultra HD Blu-ray Blu-ray Disc HD DVD CBHD AVCHD AVCREC DVD; Laser wavelength: 405 nm (blue-violet laser) 405 or 650 nm 650 nm (red laser) Numerical aperture ...