Yamaha CRW2200SX - Manual (Page 12)

Introduction
3
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.”
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.
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.)
➀ ➁ ➂
Data
If data transfer is
interrupted...
Data is stored in
buffer memory...
then buffer memory
begins to empty
When no data is left
in buffer memory...
(Buffer Underrun)
and then written
to disc
writing fails
(Buffer Underrun
Error)
➀ ➁
If data transfer is
interrupted... Once data transfer
resumes normally...
and buffer memory is
about to empty... and enough data has accumulated
in buffer memory...
writing is suspended writing resumes