HDD,CD,DVD - how is sector id distinguishable from data?

Posted by b-gen-jack-o-neill on Super User See other posts from Super User or by b-gen-jack-o-neill
Published on 2010-05-23T13:51:46Z Indexed on 2010/05/23 14:02 UTC
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Hi, as titles says, how is sector id on HDD,CD-ROM and so distinguishable from data? I mean, when I want lets say sector #52, first, head goes to track where this sector should be, than it must wait some time to spin the desired sector above the reading head. But it must somehow recognize that its sector number, and not only data that say 52. So, how is this done? Thanks.

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