A physical hole or notch, or a recorded code or mark, that is used to identify a starting point for each track on a disk.
"index mark." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/index-mark>.
index mark. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/index-mark
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