How to verify that hard drive is filled with zeroes in Linux?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Ocean Floor

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Chapters
00:00 Question
00:21 Accepted answer (Score 37)
00:55 Answer 2 (Score 9)
03:35 Answer 3 (Score 7)
03:54 Answer 4 (Score 6)
05:01 Thank you

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Full question
https://superuser.com/questions/559772/h...

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Tags
#harddrive #bash #ubuntu1210

#avk47