Yamaha CD Recordable/Rewritable Drive CRW3200 - Manual (Page 46)

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Technical Notes
CD-R/RW drives are equipped with a buffer memory, which temporarily stores
data that is being transferred. When the buffer memory becomes empty due to a
delay of data transfer for any reason, a writing error happens. Such condition is
defined as buffer underrun, and such an error is defined as a buffer underrun
error.
Buffer underrun protection is featured in the CRW3200E drive.
When a buffer underrun almost happens, buffer underrun protection temporarily
suspends the writing process. Writing resumes when enough data has
accumulated in the buffer memory. Buffer Underrun Protection in the
CRW3200E drive is extremely accurate, resulting in seamless recording before
and after suspension.
Test writing
Test writing is a function to check for the possible occurrence of buffer underrun in
your computer environment. The included CD writing software operates the test
writing function that cannot operate when buffer underrun protection is activated
(default). The buffer underrun protection should first be deactivated to use test
writing.
Disc-at-Once (DAO)
This method is used to write all data onto a disc in one operation. It writes
multiple pieces of data without placing a space between data, starting with the
innermost track of the disc. Once data is written by this method, no data can be
added to the same disc even if there is free space available on the disc. This
method is useful for making a backup copy of an entire CD.
Buffer Underrun Protection Function
Writing Methods