Hello W7 SP1 (X-64) on new SSD is configured in BIOS as first bootable drive and works fine.Additional mechanical HD (new 1TB) is formatted and is used for storage. Problem is that two of my older (internal) drives - also added internally to the existing SSD and new HDD (1TB) - with back-up storage for OS, music, photos, games, documents, videos, pictures, ... is not recognized at all by Disk Management in W7.In BIOS the two HDD are recognized as Maxtor and Fujitsu, but why do these not appear in OS? Probably an easy correction in BIOS menu, but when changing between the available modes for hard drives (AHCI, IDE, or RAID) the bootable SSD is not working because OS is installed on it.(Maybe I've omitted an important activation in BIOS? ) I've done something wrong and appreciate professional help. All drivers are uppdated via SlimDrivers [not windows Update Utility]. Motherboard: ASUS P6 Deluxe V2 SSD drive is optimised by running in setting mode AHCI and uses SATA cable connected to ICHR10R. HDD + HDD is connected with flat cable to a fully working adapter card attached to PCI 2 slot.