Sony CD-R 80min-700Mb 48x (50) 50CDQ80NSPM Manual Do Utilizador

Códigos do produto
50CDQ80NSPM
Página de 6
3
CD-R and 
CD-RW are very
different in the
way they 
record signals.
Pit formation mechanism of CD-R
To get over 60% modulation amplitude
Dye Decomposition
Substrate Deformation
Recording
Laser Beam
The CD-RW principle
The permanent recording method of CD-R is not
appropriate for the write-erase-rewrite capability
of CD-RW. That’s why CD-RW uses a phase
change film. Heat from the recording laser
changes the film between two phases: crystalline
(which is reflective) and amorphous (which tends
to scatter light). The playback laser then detects
the alternation between crystalline and amor-
phous, light and dark. This process requires a disc
surface far darker than CD or CD-R; CD-RW is only
25% reflective. As a result, CD-RW discs can only
be read on drives designed at the outset to accom-
modate a wide latitude in disc reflectivity. To read
CD-RW discs, you need either a CD-R/RW burner
or a Multi-Read CD-ROM or DVD-ROM drive.
High-speed CD-RW 
One additional wrinkle is the new generation of
High-Speed CD-R/RW drives. These can record
CD-RW at 4X to 10X standard speed — and
they’re identified by the HIGH SPEED designation
as part of the CD-RW logo on the front panel. Sony
High-Speed CD-RW discs record beautifully in
these drives, and can be read by standard-speed
CD-RW drives. However, High-Speed CD-RW 
discs cannot be written with standard-speed 
CD-RW drives. That’s usually not a problem,
considering most customers purchase media for a
specific drive.
Pit Formation Mechanism of CD-R
High-Speed CD-RW discs cannot be written with standard speed 
CD-RW drives.