Thanks for the quick response.
Basically there are three disk. Disk 1 and 2 are a raid field (2 physical disks, raid 0).
Disk 1 - 235GB:
100MB system reserved, hidden partition,
200GB previous Win 7 partition, now hidden and there are no issues with the SSD will be deleted
35GB - Secondary/emergency windows installation; I guess this one will be inaccessible in AHCI mode
Disk 2 - 3.6TB, GPT:
115MB - system created
3.5TB - data
172GB - data
Disk 3 - 120GB, SSD
100MB - system reserved
104GB - System disk - Win 7 64
10GB - reserved for additional OS
I have attached a sceenshot