Types of optical device
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This document discusses different types of CD disks including audio CDs, CD-ROMs, CD-Rs, and CD-RWs. It describes their uses and capabilities. Audio CDs can store up to 74 minutes of music. CD-ROMs can store data, databases, and other files but cannot be rewritten. CD-Rs can only be written once but are useful for backups. CD-RWs can be erased and rewritten, allowing data to be transferred between systems. The document also provides technical details about CD layer structures and how CD drives work.
Types of optical device
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- 2. And How It work’s
- 3. Types of Cd Disk’s
- 4. Audio cd :- Used to store music better quality then normal cassette’s. & It has longer life. It can store up to 74min of music. Cd Rom :- Used to store data and other files. such as data base & world processors. It can also hold music & movie files. It can only read.
- 5. Cd-R :- Once written cannot be erased. Useful to backup data. used to create music cd’s. Special layer between polycorbonate and aluminum layer to store data. Made up of photosynthetic dye. Cd-Rw:- It can erase it and write again. Used to transfer the data form one system to another. Has special layer called phase change compound layer that makes it possible to Rewrite the data.
- 7. Polycarbonate layer:- Transparent plastic layer. It protects data. Aluminum layer :- Reflects laser beam from the cd. Applied on cd containing of argon. Stores data in this layer. Acrylic layer :- Final layer Protects aluminum and polycorbonate layer Label layer :- On the top of acrylic layer. Used to print the description.
- 8. Original speed of the C.D.drive is 150kbps. C.Ddrive spins the cd like a wheel and read’s data form the cd using a laser Beam.
- 9. Cd-Rom drive:- Can read data from cd-Rom audio cd. Ex :- 52x specified that 52x150=93,600kbps. Cd-R drive :- It Can read data from cd-Rom Audio cd and cd-R disk. It can also write data to cd-R In single session data is written and closed cannot write again. In multiple session data can be added to cd-R speed specifies using 2no’s Ex :- 53x – 12x read write
- 10. Cd-RW Drive :-