Secondary Storage 1

hughes.r174270
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what is the capacity of an optical disk? 700MB;DVDs:4.7 GB;
what is the durability of optical discs? they are quite fragile because if they get scratched they make the data irretrievable if they are broken.
are the optical discs portable? they are portable but not small enough to fit in a pocket but they will fit in a relatively small space
what is the speed of the optical disk? highly variable, although blue ray are much quicker than DVD's and CD's
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