Can somebody explain this? du & ls showing different sizes

[Vijay Gill]

2009/2/15 Rick <ellis at spinics.net>:
> In article <60fdb1ad0902151205v6ef67c07v128f0c88f5895240 at mail.gmail.com>,
> Vijay Gill  <fedora-list at redhat.com> wrote:
>
>>Running du -h tells that the file occupies 512M but ls -l tells that
>>the file is a lot smaller.
>
> Apples and oranges. You get the file *size* with ls and the disk usage
> with du. They aren't the same thing.
>
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Thanks but I knew that already. I was just curious why 512Mbytes is
allocated to a file so small? Also I have provided allocsize which is
definitely not 512M!