[lug] directory/image/cd file space usage differences

[qqq1one @yahoo.com]

Recently I noticed that I get a slightly lower value
returned by du when I run it on an image vs the cd the
image is burned onto vs the directory the image was
produced from.  What accounts for this?  Example
below.

> du -hs burn
295M    burn

> mkisofs -r -o cd_image burn
<output looks OK>

> du -hs cd_image
293M    cd_image

> cdrecord -v dev=0,4,0 -blank=fast -data cd_image
<output looks OK>

> mount /dev/cdrom

> du -hs /mnt/cdrom
294M    /mnt/cdrom

> mkdir ~/burn2

> cp -a /mnt/cdrom1/* burn2

> du -hs burn2
295M    burn2

> diff -rq /mnt/cdrom1 burn2
<no differences reported>

> diff -rq burn burn2
<no differences reported>


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