Rebuild degraded (two disks?) raid 5 array

[mfoolb]

Hi,

 

I'm trying to recover a raid 5 array from a friend whose Buffalo Terastation (rack mountable with 4 disks) is no more working after several electric failures.

The array is damaged, I can 6 six partitions in almost all disks but can't add more than to disks with mdadm.

 

I've made a dd copy of each (2TB) disks and I'd like to work with those instead of the original disks.

I can use linux or windows box.

 

Can anyone help me recover most of the data?

 

Thank you.