Data is not recorded magnetically on a(n) but is encoded as a series of pits on the disk surface.

The answer to this question is "CDs and DVDs", both are types of optical media drive where you can store data and read data. The CD stands for Compact Disk while the DVD stands for Digital Versatile Disk. Thus, to complete the sentence we have it "Data is not recorded magnetically on a CDs and DVDs but it is encoded as a series of pits on the disk surface".

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