CDs and DVDs. Are types of optical storage media that consists of a flat, round, portable disc made of metal plastic and lacquer. Store software, data, digital photographs, movies, and music. Characteristics of CDs and DVDs.
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Picture CD usually is 1024x1536 pixels
The cost of a picture CD is about 10 dollars per role of film
Stores multiple rolls of film using the Image Pac or PCD
Designed for commercial and professional users
Resolutions ranging from 128x192 to 4096x6144 pixels
Store images from 35mm film, negatives, slides and scanned itemsPicture CDs and Photo CDs
To be able to write on the CD-R you need a CD-R drive to burn the CD
Has a speed of 40x or more
CD-RW is a rewritable CD that can be erased.
Is much like a floppy disc
Only down fall is that the more it is erased the more faulty the CD becomes
The CD-RW drive has a speed of 52x or moreCD-Rs and CD-RWs
Can store up from 4.7GB to 17 GB the storing capacity has more than enough to hold a telephone book containing every resident in the United States
The goal of the DVD technology is to meet the needs for home entertainment, computer usage and business data
DVD-ROM players can read up to speeds 48x or more
Look just like the CD-ROM and sometimes are easily confused
First involves making the disc denser by packing the pits closer together
Second involves using two layers of pits. For this to work the lower layer of pits is semitransparent so the laser can be read through the upper level. This technique doubles the storage capacity of the disc
Finally some discs are double sided and need to turn it over when you are done with the one sideDVD-ROMs