Description Of Newly Adapted Technology; Features And Format Of +Rw - Hitachi DZ-GX3300E Service Manual

Description of Operation > Description of Structure / Description of Newly Adapted
(a) Disc drive unit
(b) Lens unit
(c) EVF unit
(d) LCD unit
(e) AVJ-H/M/L
circuit board
( f ) FRT-H/M/L
circuit board
(g) GSL-3M/2M/1M/L
circuit board
(h) LMF-H/M/L
circuit board
( i ) MAN circuit board
( j ) SHE-H circuit board
Fig. 3-1-1 Confi guration of circuit boards and their mounting locations

3-2 Description of Newly Adapted Technology

3-2-1 Features and Format of +RW

A +RW is a disc that can be written approx. 1000 times. The "DVD+RW Alliance" establishes its
specifi cations: These specifi cations are similar to those of DVD-RW, but the wobble and address
data recording format are different.
"Wobble" refers to the frequency of groove which is provided to guide a pickup. The +RW address
data is recorded and superimposed on this groove; the DVD-RW address data is recorded in an area
that is called a "land" between the grooves.
Table 3-2-1 Comparison of Specifi cations between +RW and DVD-RW
Item
Disc diameter
Storage capacity
Thickness of disc
Rewritable number of times
Refl ectance ratio
Track width
Recording/playback
laser wavelength
Wobble
Address data recording format
(a)
( f )
(e)
+RW (single layer)
12cm
4.7GB/ side
1.2mm
At least 1000
18 - 30%
0.74 m
650nm
817kHz
LPP (Land Pre-Pit)
3 - 2
(d)
8cm 12cm
1.46GB/ side 4.7GB/ side
ADIP (Address In Pre-groove)
(b)
(g)
( j )
(c)
( i )
(h)
: Same as on left column
DVD-RW
8cm
1.46GB/ side
140kHz