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Yamaha CRW-2100IX Manual

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Introduction
*1. Pure-Phase Laser System (patent applied for)
Technology that reduces phase interference of the laser beam, so that it shines accurately on the disc.
*2. Jitter value
An important measure of recording quality. This has been improved 25% compared with Yamaha models
not using this technology.
*3. Running OPC
CD-R/RW discs vary by manufacturer in their recording characteristics, and the laser output required to
write data differs by disc. Running OPC is technology that solves this problem by automatically adjusting
the output of the laser according to the material of the disc on which data is being written.
*4 If you attempt to write at 16X or 12X speed but the CRW2100IX drive detects that the quality of a
target CD-R disc and other things are inappropriate for such speeds, the drive will automatically slow
down the writing speed optimally for the disc.
About IEEE1394
IEEE1394 is an industry standard approved by IEEE (Institute of Electrical and
Electronics Engineers). The serial interface has a broad bandwidth and is fast
enough to bidirectionally transfer large amounts of digital video and audio data
between electronic devices including computer peripherals. Also known as
FireWire and i.LINK, the IEEE1394 interface allows units to transfer data or
various controls over a single IEEE1394 interface cable. Unlike legacy serial
interfaces such as RS-232C, IEEE1394 allows a daisy-chaining (serial
connection) of devices and any two devices in the chain can transfer data to
each other. IEEE1394 also supports a tree (parallel) connection of devices. In
addition to this flexibility, IEEE1394 also eliminates the need for complicated
settings as found in SCSI (Small Computer System Interface), such as device ID
and termination. As of writing, IEEE1394 supports three different data transfer
rates: 100Mbps, 200Mbps, and 400Mbps.
About Partial CAV (Constant Angular Velocity)
Writing to a CD-R disc is normally done using CLV (Constant Linear Velocity)
method. In this method, the disc rotation speed will be so adjusted as to keep
a constant data transfer rate at any portion of the disc. In other words, the disc
rotation speed will vary in CLV writing.
In contrast, CAV (Constant Angular Velocity) method uses a constant disc
rotation speed at any portion of the disc whereas the data transfer rate will vary.
Because CAV method has an advantage to largely increase the data transfer rate
with a minimum load to the drive’s mechanism (compared to CLV’s rotation
speed adjustment), many of current CD-ROM drives use CAV method.
CD formats define the constant linear density of written data (data should be
written onto the disc track in the constant pitch) so that amount of recorded
data per disc rotation will increase as the writing point moves from the inner to
the outer. In other words, in CAV writing the outer portion has an increased
data transfer rate.
The CRW2100IX drive uses CAV method in the inner portions as well as CLV
method in the outer portions (Partial CAV) in order to enable up to 16X-speed
writing. The drive will control the disc rotation speed to start writing at 12X
speed in the inner portions, gradually accelerating up to 16X speed and
maintaining 16X speed in the outer portions.
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