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	Different approaches for writing to BD-R/RE were proposed, each with their own advantages and disadvantages. When developing BDR-203, we investigated the available and prevalent media in order to design and implement the best possible recording control method as of today under our design policy for this product: Pursue stable writing performance. Stable recording and playback are critical requirements for dual-layer disks because the control signals can easily be disrupted as light reflecting from the layer being recorded to and light reflecting off the layer that is not being recorded to interfere with each other. So we developed dedicated optical parts, along with carefully reviewing the mutual arrangement positions of the parts, and attained sufficient performance. Even if the interlayer thickness of DualDisc changed significantly within the specifications, the recording performance and improved reliability are realized by stable control.
	BD-R LTH (organic dye media) types use the same dye used for CD-Rs and DVD-Rs in the recording layer. For this reason, BD-R LTH media are getting a lot of attention, and significant cost reductions are expected when the scale of commercial production ramps up just as was seen with CD-Rs and DVD-Rs previously. Since initial development, BDR-S03J was envisaged as a way to provide stable writing to BD-R LTH media. As BD-R LTH media have properties vastly different from metal BD-R media, we embedded various developmental elements into BDR-203. Of particular interest in this regard is the enhanced focus control (control that adjusts the laser focus to recording layer), with which we achieved stable operation. In addition, we added controls that enable optimal, continuous recording---checking the recorded results as you go---as part of our pursuit of total improvement of the recording performance.
	The optical pick-up is constantly exposed to the disk when playing and recording. A stable, high-precision operation of the optical pick-up is crucial for the stable processing of the circuit system and consequently for the stability of the whole drive. This is particularly important for high-density blu-ray disks (BD). BDR-S03J is infused with all of Pioneer’s LCD technologies, and introduces an approach that theoretically enables the removal of all kinds of aberrations that may occur within the optical pick-up or from the disk structure. This has led to the stable generation of control signals, realizing improved recording and playback performance as well as stable operation of the drive. When a disk is inserted, but before the drive starts reading the disk, it checks the disk and optimizes optical correction in order to stably record or play back the disk by removing aberration as much as possible.
	Due to the non-contact reading mechanism for optical disks, when the drive receives shock or vibration during recording or set-up (drive is inspecting the disk properties upon its insertion), the tracking deflects and in the worst case recording may fail. Therefore, in principle, it is ideal that the drive only be used in stable conditions. With BDR-203, we revised the control technique and reduced the weight of the pick-up while improving the mechanical parts. In addition, a shock-absorbing mechanism was built in for advanced stable recording performance under conditions where external shocks and/or vibrations are present.
	It is sad to say that, amongst all the CDs and DVDs out there, poor-quality disks that don’t comply with standards are found here and there. You also don’t want disks with good memories scratched or smeared, but things do happen. In creating BDR-203, we turned back to our original pursuit: Saving our customers’ valuable data. As a result, BDR-203 was infused with all our know-how as a long-standing optical disk development manufacturer and embedded with the best possible disk-saving technologies. BDR-203’s improved capabilities can support the playback of media with scratches and fingerprints, defective recordings, non-standard track pitches, mass eccentricity (even when the disk is affixed with a sticker), or eccentricity (center hole position is misaligned). In particular, for media with mass eccentricity or misaligned center holes, BDR-203 automatically controls the rotational speed in order to prevent damaging the drive. For a stable recording and playback, we recommend that disks listed on the supported media list are used.