df -h, du -ahx and flash size not match

[Brian Norris]

On Mon, Feb 20, 2012 at 9:41 AM, Esteban Lopez <elopez at softel.net.mx> wrote:
> If I create big files and I run du -ahx command over / I get a  total of
> 593M
>  of info
> Why the size not match ? why I can have 593M in my ROOTFS if I only have
> 469762048 bytes?? Why df -h report 161M used in rootfs if du report 593M?

http://www.linux-mtd.infradead.org/faq/ubifs.html#L_df_report