MetaROUTER on RB751G-2HnD - HDD free space

Hello,
I am the new Mikrotik user, I have the following problem with my recently bought RB751G-2HnD.
I’ve created MetaROUTER and imported the openWRT image, and set disk size to 40mb.
Afterwards I have deleted MetaROUTER, but the free HDD space did’t increased.
I was doing it just like it is described here: http://wiki.mikrotik.com/wiki/Manual:Metarouter

Before MetaROUTER was created I am almost 100% sure that it had over 42mb of free HDD space, after creating and removing MetaROUTER the space decreased to 24mb.

Where, what should I do to retreive my free disk space back?
I have already tried to make the hard reset but it didn’t work.

Please help me with my somehow annoying for me problem.
mt.jpg

NetInstall.

It will erase the entire drive during install.

It solved my problem, but I had to connect using XP, with W7 netinstall could not find my device.
Thnx.

The firewall on Windows 7 blocks it unless you allow it access. Then, it works fine.