COMPUTER ARCHITECTURE
SECONDARY STORAGE DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Smaller pits are more densely packed
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Larger pits can hold more data
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Concentric circles instead of a spiral
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Larger read/write head
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Detailed explanation-1: -The only real difference between the CD and DVD is that everything for the DVD is smaller: narrower and shorter pits and a smaller pitch to pack everything in more tightly. As you’ll see below, this means denser storage of information, so a DVD can store more data per unit area than a CD.
Detailed explanation-2: -The most significant difference that you should note here is that a CD has a storage capacity of about 700 MB, while a DVD has a comparatively higher storage capacity, ranging from 4.7 GB to 17 GB.
Detailed explanation-3: -Although Sony has yet to deliver on this promise, storage capacities have continued to increase with each new generation of optical media: A CD can store up to up 700 megabytes (MB) of data. A single-layer DVD can hold 4.7 gigabytes (GB) of data, and a double-layer disk can hold 8.5 GB.
Detailed explanation-4: -Warning: It’s impossible to differentiate a CD from a DVD by size or shape alone, since both types of media are manufactured using the same standardized dimensions. More specifically, they’re both 120 millimetres (4.7 in) in diameter and 1.2 millimetres (0.047 in) thick.