Yamaha CD Recordable/Rewritable Drive CRW-70 Owner's Manual page 16

Buffer Underrun defined
CD-R/RW drives are equipped with a buffer memory. This memory
temporarily stores data while a disc is being recorded. When the 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."
Data
Data is stored in
the buffer
memory...
and then written
to the disc
A Buffer Underrun Error will permanently ruin the disc.
Yamaha Buffer Underrun Protection
Buffer Underrun Protection is featured in the CRW-70 drive 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 the buffer
memory. Buffer Underrun Protection on the CRW-70 drive is
extremely accurate, resulting in seamless recording between stop and
continuation points.
If data transfer is
interrupted...
and the buffer
memory is about
to empty...
Yamaha Buffer Underrun Protection ensures error-free results.
If data transfer is
interrupted...
then the buffer
memory begins
to empty
writing is
suspended
When no data is
left in the buffer
memory... (Buffer
Underrun)
writing fails (Buffer
Underrun Error)
Once data transfer
resumes normally...
and enough data has
accumulated in the
buffer memory...
writing
resumes
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