Why does Blank DVD-R hold more data than Blank CD-R?
Ten years after blank CD-R flourished in the optical media industry, DVD-R was developed as a new form of optical media that could handle both audio and video data because of its impressive data compression. DVDs are currently the industry standard for video data. They use basically the same method of capturing data as CDs except they are able to hold about 7 times as much data.
Blank CDs can hold upto 700 MB of data, whereas Blank DVD-R can hold about 4.7 GB. Like CDs, DVDs rely on a thin layer of aluminum in which microscopic bumps or pits are etched so that a laser can interpret them as data. DVDs have smaller bumps than CDs both in width and length. They are almost half the size in each direction allowing for almost 4 times as much data due to compression.
Also, DVDs have a more advanced form of error correction that doesn’t require as much space as CDs do. CDs used an old form of error correction (which basically involved repeating the data verbatim), whereas DVDs use a more sophisticated and up to date method that doesn’t require as much space. This frees up a lot more space for data.
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