Compact Disks are optical media; they record information by burning pits in the disk and use a laser and optical sensor to detect whether a pit is present or not. A hard disk is a magnetic system - a recording head is moved close to the surface of the disk and used to read or write information.
It is these different technologies that lead to the difference in abilities; CDs are more robust and cheaper, but slower - particularly when writing or re-writing information. Hard drives can hold more information, are faster and can be rewritten indefinitely.
It is these different technologies that lead to the difference in abilities; CDs are more robust and cheaper, but slower - particularly when writing or re-writing information. Hard drives can hold more information, are faster and can be rewritten indefinitely.
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