Sorry André, but this is not the answer to my question!
as kroll-ontrack-partner i know about their services, and i also know about their prices :-). but anyway, apart from the price the complete thing is not that easy - also for ontrack!
however, before i'll give them a try (if i have enough money to do that..i have to sleep some nights to decide this..) i want to understand one single thing: why do i find a data-state from may 2012 on my copy of the vmdk!
let me say one more thing: i do my work with a copy of the original vmdk, and till now without any! write-procedure to this copy of the vmdk - of course, i would never ever do some write-procedure to the original RAID5 since i know of the damage of this system! in addition the defective RAID5 is not in use at all since the DD process for creating the copy....and this - please correct me if you think my position is wrong - does not make anything worse. it's a safe way for a recovery-process.
Andi