LaCie Slim Blu-ray - Manual (Page 19)

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Helpful Technical Information
User Manual page 19
4.4. Blu-ray Writing Methods
Disc at Once (DAO) – 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 all of the information is written in one session, but SAO allows
for the ability to begin another session and record at a later time.
This mode allows for greater control of the recording process than
Packet Writing (PW) or TAO. Additionally, 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. 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 an IR-compatible device without finalizing the recording.
MBR creates a very short boundary zone around a recording session
so a compatible player or DVD-ROM drive does not attempt to play
beyond the border of the recorded area. Instead the unfinished disc
is read by a player that supports IR.
Restricted Overwriting (RO) – If a disc has already been written to,
new data segments can be randomly inserted anywhere 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 - Disc Writing Methods
DAO SAO IR MBR RO PW
CD X X X
DVD X X X X
BD-R X X
BD-RE X X