Its very hard to write a single movie in a normal compact discs and this resulted in a shift to DVDs where the storage capacity is increased to 4.7Gb.Nowadays Blu-ray discs are gaining popularity with much more storage capacity of 50Gb for a dual layer discs.
Now there is a upcoming technology that uses holographic digital storage.This will enable users to store more than 100 movies in a single disk.Under the holographic technology,data is stored in layers in the disk using split laser beams and not just on the surface as is done now.A single CD would be able to carry around 1 terrabyte of data,which is equivalent to around 110 film DVDs.
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