Sony RDR-GX7 - Manual (Page 20)

The RDR-GX7 offers the recording
convenience provided by the disc
format. At present, there are two basic
types of home AV-use DVD recorders
in terms of recording operation: tape
model recording and disc model
recording.
Tape model recording operates in
the same way as an ordinary VCR;
when the recording button is pressed,
recording begins from the current
position on the tape and continues
recording the contents in a linear
fashion, even if there is content already
recorded, until the stop button is
pressed. For this reason, there is
concern about accidentally recording
over important content.
Disc model recording, on the other
hand, automatically finds blank areas
on the disc and records on them. The
RDR-GX7 performs disc model
recording in all formats, so there is no
concern about accidental erasure of
previously recorded content.
In addition, while the type of
recording in each format differs
according to its respective
specification, the RDR-GX7 has been
designed to perform recording in a
manner that efficiently uses blank
space on the disc in all formats.
First, with DVD-RW in VR mode,
the characteristics of disc recording are
taken full advantage of, while all blank
areas on the disc are efficiently used.
When a single disc is used, during
editing, unwanted titles can be erased,
and unwanted parts within titles can be
erased, leaving blank areas here and
there on the disc. Then, DVD-RW VR
mode enables those separate blank
areas to be recorded again, and played
back as a single title.
For high playback compatibility
with DVD playback equipment,
recording in DVD-Video format
(DVD-RW Video mode / DVD+RW /
DVD-R) can be performed, though
editing operations like with VR mode
are not possible. Since DVD-R has
been designed primarily for playback
compatibility, and cannot be re-
recorded, new recording can only be
performed after recorded titles. Most
DVD recorders, even with DVD-RW
Video mode recording, perform
recording in the same way as with
DVD-R. Therefore, even though DVD-
RW is a disc that can be re-recorded,
apart from the last portion on the disc,
even if previously recorded sections
are erased there is no extra capacity
for new recording. However, the RDR-
GX7, during DVD-RW Video mode
recording, enables new recording to be
performed on the largest blank area on
the disc, regardless of its location on
the disc, and this enables more
efficient use of disc capacity. In
addition, even with re-writable
DVD+RW recording, recording is
performed in the same way as DVD-
RW Video mode, so there is no
concern about accidental data erasure,
while disc capacity is used more
efficiently.
Chapter 4-3
Features
RDR-GX7 Technical Notes
20
TAPE MODEL
DISC MODEL
Recording Types
Type 1
Type 2
Type 3
Record from inner blank areas
(non-overwriting)
Record on only outer blank area
Record only on largest blank area
(non-overwriting)
blank area
New Recording
blank area
blank area
blank area
blank area
Start Stop
Start Stop
Start Stop
-RW
-RW
-R
+RW
VR
DVD-Video
Compatible
DVD-Video
Compatible
(DVD-RW)
(DVD-R)
(DVD-RW/+RW)
1 2 5 5 4
Start Stop
1 2 5 blank 4
1 2 3 blank 4
1 2 5 4
1 2 3 5 4
mistaken
over-write
unwanted content
Disc model recording