What is the purpose of the holes marked "Do Not Cover" on hard drives?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Breezy Bay

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Chapters
00:00 Question
00:37 Accepted answer (Score 182)
01:37 Answer 2 (Score 64)
02:55 Answer 3 (Score 2)
05:06 Thank you

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Full question
https://superuser.com/questions/368774/w...

Question links:
[Image source]: http://www.flickr.com/photos/sonicwalker.../

Answer 1 links:
[Wikipedia hard drive entry]: http://en.wikipedia.org/wiki/Hard_disk_d...

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Tags
#harddrive

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