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User Manual page 15

4.3. DVD±RW Writing Methods

Disc at Once (DAO) – A DVD writing process in which the entire

DVD is recorded in one session, and data cannot be added after

the recording is ﬁnished. This differs somewhat from the CD-R DAO

method because the lead-in area, data area, and lead-out area are

all written sequentially.

Session at Once (SAO) – A writing process which is similar to DAO,

where information is written in a session, but allowing for record

further recording at a later time. This mode provides for greater

control of the recording process than Packet Writing (PW) or TAO,

and more disc space can be utilized because there is no need for

gaps between tracks.

Incremental Recording (IR) – A writing process that is similar to the

Session at Once (SAO) CDR writing method; ﬁles may be added

directly to the DVD-R disc one recording at a time, instead of record-

ing the ﬁles to a hard drive before writing the disc. The minimum

recorded size, though, must be at least 32KB (even if the ﬁle to be

recorded is smaller than that), and capacities and write speeds are

decreased due to the overhead of combined lead-in/out areas and

data. Also, the disc must be ﬁnalized before it may be played back

by a drive other than the drive recording the disc.

Multi-Border Recording (MBR) – A writing process that is very similar

to IR, MBR allows you to make an IR disc and then play the disc

back on a device that recognizes this type of recording method.

MBR creates a very short boundary zone around a recording ses-

sion so a compatible player or DVD-ROM drive does not attempt to

play beyond the border of the recorded area, instead allowing the

unﬁnished disc to be read by a player that supports this recording

method.

Restricted Overwriting (RO) – With this method, if a disc has already

been written to, new data segments can be randomly inserted any-

where within the recorded boundary. New data, however, can only

be added to an area of the disc that has already been recorded over

and from the point where the last session was stopped.

Packet Writing (PW) – A drag-and-drop writing process that is very

useful for data backup. Buffer underrun* is impossible in this mode,

because the data is written in “packets” of a few KBs. Packet Writing

is a CPU-intensive process because it constantly checks the avail-

able space on the disc.

* Buffer Underrun – The recording of a disc is a system-intensive ap-

plication, and the rewritable drive needs a constant stream of data.

A buffer underrun occurs when the stream of data to the rewritable

drive is not fast enough to keep the rewritable drive’s buffer full,

causing an error in the recording process. If this problem occurs

often, turn down the recording speed.

Table 02 - DVD±RW Writing Methods

DAO SAO IR MBR RO PW

✔ ✔ ✔

DVD

✔ ✔ ✔ ✔

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 24 25

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