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<p>of <a href="page.php?w=electronic_media">electronic media</a> and data, and <a href="page.php?w=archival">archival</a> storage.</p>

<p><big> Design and technology </big></p>
<p>The encoding material sits atop a thicker substrate (usually <a href="page.php?w=polycarbonate">polycarbonate</a>) that makes up the bulk of the disc and forms a dust defocusing layer. The encoding pattern follows a continuous, spiral path covering the entire disc surface and extending from the innermost track to the outermost track.</p>

<p>The data are stored on the disc with</p><p>
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