Recording on CD-R is a matter of irradiating a laser and printing a record mark (pit) on the organic coloring matter of record material at the high temperature of 300 degrees.
Laser power is so controlled that, at the start of recording on the current CD-R disc, the drive will supply the laser power in the expectation of a normal and stable recording after a period running from several to some dozens of microseconds.
And when the set-up power has been ever achieved, a drive will be controlled to supply a stable set power. Generally this control is called APC (automatic power control).

For example, let's suppose that it takes 5μsec to supply the power which can normally form a record mark.
When the linear velocity = 1.2 m/sec. and the recording speed = 16X, the disc will move 96μｍ for 5μsec as follows.
1.2m/sec X 16 X 5μsec = 96μｍ
That is, the period until recording power is normally controlled by this APC circuit becomes a non-recorded part (= gap).

In producing CRD-BP2 commercially, we reviewed this APC control system and cut down the standup time of laser to approximately 3μsec.
In this case, the gap size of CRD-BP2 will be approximately 45μｍ, as follows:
1.2m/sec X 12 X 3μsec = approximately 45μｍ.
Then, we were able to achieve 15μｍ (Approximately 1/3 of CRD-BP2) on CRD-BP1300P at 12x speed with reviewing device and so on.

Now, regarding CRD-BP4 and CRD-BP1400P as the main topic, we have succeeded in eliminating a non-recorded part in a connection point by reviewing of APC circuit. (Please forgive my waiving a detailed technical explanation.
However, if I can explain it simply, we devised the APC control so that normal record power can be outputted simultaneously with the start of the recording.)

This is RF signal waveform when BURN-Proof works at 16x record speed. Can you find where is connection point ?

BURN-Proof predicts Buffer Under Run error, and when it has judged that there is an error, the drive at once interrupts the recording. After receiving the recorded data, the drive searches the area to be recorded and compares the data on the disc with the data in the buffer memory so that it can restart the seamless recording at the discontinuation point in the recording.

< Chapter 1 [About the quality of a BURN-Proof's link portion]
< Chapter 2 [Distance to the achievement of zero gap on BURN-Proof]
< Chapter 3 [The birth of CD-R/RW drive which can stand up to a shock]
< Chapter 4 [Evolving BP technology, New standard for high speed recording]