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Untitled Document
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Kinds of CD-R |
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| CD-R discs are usually called "gold", "white gold", "blue",
"green" or "blue" ones. This comes from the physical color of
each disc. More specifically, however, the kind and name of
a CD depend on which material is applied to the recording and
reflective layers, which are the two most important layers
of CD-R. |
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Dye layer
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Reflective Coating
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Writing Side Color
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Popular Name
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Gold
Silver
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Gold
Blue
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Gold-Green
Siver-Blue
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Gold
Silver
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Gold
Thin Green
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Gold
White Gold
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Azo
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Silver
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Blue
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Dark Blue
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Features of Dye Layers |
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Classification
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Cyanine
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Phthalocyan
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Azo
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BLUE
or Green
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Green
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Dark Blue
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Blue(with Silver)
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Greenish White
(with Silver)
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Dark Blue
(with Silver)
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Advantages
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Recording Margin
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Durability
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Durability
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Disadvantages
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Relative Durability
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Price
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Manufacturers
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日:TDK, Pioneer,Maxell
台:Ritek, CMC, Princo
美:Kodak, Fuji
韓:SKC
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日:Mitsui, Ricoh
台:Prodisk, Ritek
美:Kodak
韓:SKC, Doremi |
日:Mitsubishi |
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Chemical Structure of Dyes |
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Kinds of CD-RW |
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| Rewritable CDs are classified into two depending on their
phase change materials: ternary Ge-Sb-Te alloys and quaternary
Ag-In-Sb-Te alloys. |
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Classification
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Class of Ternary Alloys
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Class of Quaternary Alloys
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Alloys
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Ge-Sb-Te
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Ag-In-Sb-Te
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Developers
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Matsushita, Asahi Chemical
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Ricoh, TDK
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Merits
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High track density
High overwrite cyclability
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High linear density
High difference in reflectivity
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Demerits
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Low linear density
Low difference in reflectivity
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Low track density
Low overwrite cyclability
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Before recording
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Crystal
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Crystal + Amorphous
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After recording
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Amorphous
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Amorphous
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Applicable discs.
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PD, DVD-RAM, DVD+RW
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CD-RW, DVD-RW
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CD-R/RW Lay Out |
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a.
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Disc Radius : 60mm (Φ120mm) |
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Max. Prog. Area : 58mm (Φ116mm) |
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Max. Information Area : 59mm (Φ118mm) |
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Prog. Start. : 23mm (Φ46mm) |
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Lead in Start : 22.5mm (Φ45mm) |
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ATIP Start : 7.5mm (Φ15mm) |
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Center Hole : 60mm (Φ120mm) |
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Clamping Area : min13~max16. |
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(Φ26~33mm) |
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CD-RW Areas |
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PCA : An area the OPC is performed to find the optimum laser
power for the writing laser and |
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write strategy. |
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PMA : Located before the Lead In Area, the PMA is where the
TOC (Table of Contents) |
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information is contained temporarily when tracks are written
in a session, which is not yet closed. The TOC information includes
track number, and start and end position. The PMA is usually
used when the Track-at-once recording mode is engaged. Unlike
the CD-ROM drives, CD-R/RW Recorders can read the data at certain
position. |
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Lead In Area : An area where the TOC information of the disc,
or a session is written at "closing. |
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"closing." The TOC information is the same as
the one in the PMA area. It also contains information on disc
capscity and the producers. |
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| Program Area : An area where user data is contained. |
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Lead Out Area : Located at the end of a session, the Lead
Out Area indicates |
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that the end of the data has been reached. The Area comes
right after the Program Area. |
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