I am fairly sure that blok size of my second raid is 128kb, anything else produces less files that are readable (but still corrupt)
I also know that disk order is the same as raidset 1. if I change disk order and I restore a pucture it is much clearer that files are getting mixed.
I think there must be a disk offset, but I am not sure how to find it for raidset 2.
Ok I fixed my problem
first thing I had done when raid dropped out was a MBR backup of all disks
I had tried creating raid with same settings but all disk where blank.
Yesterday I thought about it and restored as last attempt my MBR and viola my partitions where back. although there was corruption.
I used R-studio to restore and so far all files are without any corruption.
1 mayor thing that worries me is that the raid (software) does not report that 1 disk is giving up.
used a few smart reading programs all reported that disk has a problem.
I also used manufactures disk software and that reports disk failed.
This is a mayor fail on intels part
maybe the disk have been degrading for months and software did not report this.