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Message: <blockquote data-quote="2cvbloke" data-source="post: 451604" data-attributes="member: 199791">Actually, no, a hard drive only has 1 arm onto which the Read/Write heads are fixed, this runs accross the surfaces of the disk platters, so for recording and playback, the heads are moving rapidly between writing and reading the platters... <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" />Here's a photo of a HDD witht the top off... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>