Zen Technology and Sony have developed drives that use several laser beams concurrently to learn discs and write to them at higher speeds than what could be possible with a single laser beam. The free online slots present metric 20 mm (0.Seventy nine in) length intervals, and equipment can be mounted either within a slot or bridging between free online slots, making it attainable to adjust the place of accessories in smaller intervals than the length of the slot. Each sub-block has a most length 255 bytes and free online slots is prefixed with a byte indicating the number of knowledge bytes in the sub-block.

The code values shown are packed into bytes which are then packed into blocks of as much as 255 bytes. Optical disc media are 'learn' starting at the interior Online slots radius to the outer edge. Double-sided media could also be used, however they are not simply accessed with an ordinary drive, as they should be physically turned over to access the info on the other aspect. Half top drives are additionally faster than Slim drives on account of this, since extra power is required to spin the disc at larger speeds.

Readability (the ability to learn bodily damaged or soiled discs) may range amongst optical drives resulting from variations in optical pickup systems, firmwares, Free slots and damage patterns. A very powerful part of an optical disc drive is an optical path, which is inside a pickup head (PUH). In addition, CDs at 27,500 RPMs (comparable to to read the inside of a CD at 52x) could explode inflicting intensive damage to the disc's surroundings, and poor high quality or damaged discs may explode at lower speeds.

This allows for both sides of the disc to be learn and written to at the identical time, and for the contents of the disc to be verified throughout writing. With an choice in the optical disc authoring software program, optical disc writers are able to simulate the writing course of on CD-R, CD-RW, DVD-R and DVD-RW, which allows for testing corresponding to observing the writing speeds and Slots free patterns (e.g. fixed angular velocity, fixed linear velocity and P-CAV and Z-CLV variants) with totally different writing pace settings and testing the highest capability of a person disc that would be achievable utilizing overburning, with out writing any data to the disc.

In Zen's system (developed in conjunction with Sanyo and licensed by Kenwood), a diffraction grating is used to break up a laser beam into 7 beams, which are then targeted into the disc; a central beam is used for focusing and tracking the groove of the disc leaving 6 remaining beams (3 on either side) that are spaced evenly to learn 6 separate parts of the groove of the disc in parallel, successfully rising learn speeds at lower RPMs, lowering drive noise and stress on the disc.