Yamaha CRW2200, CRW2200NB CRW2200, CRW2200, Buffer Underrun Defined, Yamaha Buffer Underrun Protection

Introduction

*1 16X- or 20X-speed writing is enabled with the Partial CAV method. (→P. 5)

*2 10X-speed writing/rewriting is enabled with the CLV method, and the 4X-10X Full CAV method. (→P. 6)

Buffer Underrun Defined

CD-R/RW drives are equipped with buffer memory. This memory temporarily stores data while a disc is being recorded. When buffer memory becomes empty (due to unexpected interruptions or the system’s inability to keep up with the writing process), a write error occurs. This error is known as a “buffer underrun error.”

➀ Data	➁	➂
	Data is stored in	If data transfer is
	buffer memory...	interrupted...
	and then written	then buffer memory
		begins to empty
	to disc

When no data is left in buffer memory...

(Buffer Underrun)

writing fails (Buffer Underrun Error)

A Buffer Underrun Error will permanently ruin the disc.

Yamaha Buffer Underrun Protection

Buffer Underrun Protection is featured in Yamaha’s CRW2200 series CD-R/ RW drives. When a buffer underrun is about to occur, a buffer underrun error is prevented by temporarily suspending the writing process. Writing resumes when enough data has accumulated again in buffer memory. Buffer Underrun Protection on the CRW2200 series is extremely accurate, resulting in seamless recording between stop and continuation points.

➀	➁
If data transfer is	Once data transfer
interrupted...	resumes normally...
and buffer memory is	enough data has accumulated in
about to empty...	buffer memory...
writing is suspended	writing continues

Yamaha Buffer Underrun Protection ensures error-free results.

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