Why raw disk read in C# reads from slightly shifted offset?

Why raw disk read in C# reads from slightly shifted offset?

References

Reference NO 1

http://stackoverflow.com/questions/15185295/why-raw-disk-read-in-c-sharp-reads-from-slightly-shifted-offset

Reference NO 2

http://stackoverflow.com/questions/1136414/low-level-c-style-i-o-in-c-sharp-for-reading-fat32

Reference NO 3

http://stackoverflow.com/questions/15051660/physical-disk-size-not-correct-ioctldiskgetdrivegeometry

Reference NO 4

http://stackoverflow.com/questions/9530219/buffered-read-from-disk

Reference NO 5

http://www.developerfusion.com/article/84519/mastering-structs-in-c/

Reference NO 6

http://visualstudiomagazine.com/articles/2010/06/23/memory-mapped-files.aspx

Reference NO 7

http://msdn.microsoft.com/en-us/library/ms809762.aspx

Reference NO 8

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