Yamaha CRW2200SX manual Buffer Underrun Defined, Yamaha Buffer Underrun Protection

Introduction

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 writing error occurs. This error is known as a “buffer underrun error.”

➀ Data ➁ ➂

Data is stored in

If data transfer is

interrupted...

then buffer memory

When no data is left

buffer memory...

and then written to disc

begins to empty

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

about to empty...

writing is suspended

and enough data has accumulated

in buffer memory...

writing resumes

Yamaha Buffer Underrun Protection ensures error-free results.

Test-writing for Buffer Underrun

You can run a check for the likely occurence of Buffer Underrun by Test-writing a CD-RW disc. The occurrence of a Buffer Underrun depends on your computer system and the CD-R/ RW drive.

Most writing software includes test-writing functions to check the likely occurrence of Buffer Underrun before actually writing the disc.

Buffer Underrun Protection is set to ON by default. Test-writing is not available in this setting. To use test-writing with your computer system, the Buffer Underrun Protection should be set to OFF. (For more details, refer to the documentation that came with your CD writing software.)

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