what does it mean if a disk utility sees empty sectors?

I had an XP unit go down and when I ran a utility called SPinRite which usually works well. I noticed something I never saw before, it found empty sectors?
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What exactly does it mean when it finds empty sectors?
jimmysupportAsked:
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Gary CaseConnect With a Mentor RetiredCommented:
Simply sectors that do not contain data -- this is normal.
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jhanceCommented:
Unless, of course, the disk is FULL!  ;-)
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jimmysupportAuthor Commented:
It is a sata disk....and it checked out ok with spinrite, but showed a lot of empty sectors....I never saw that before....
Windows won't see the installed windows directory and tells me I have two partitions, I was going to run repair on it...we only had one partition on that disk.
So I was wondering if there was an issue.

I thought all sectors had something on them when it was formatted. Not data...but ?????

You think it is ok?

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zozue49Commented:
Check out the size of the total space occupied by the empty sectors. If it's aroun 10 mb is normal, XP just reserves them when installing.
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