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I have this motherboard Intel® Desktop Board D975XBX2, for which here is the manual .

The manual says it has:

Eight Serial ATA channels (one device per channel):   

Four RAID capable Serial ATA (3.0 Gb/s) connectors (black) via the ICH7DH  

Three RAID capable Serial ATA (3.0 Gb/s) connectors (blue) via 
the Marvell RAID controller   

One RAID capable Serial ATA (3.0 Gb/s) connector via the Marvell 
RAID controller, compatible with an external Serial ATA drive 

Now the first four SATA ports work without any problem. But any device which is connected to the lower four SATA ports are not detected by the computer.

What should I do? Even when I go to the BIOS, it doesn't show anything.

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up vote 6 down vote accepted

Only the 4 first SATA ports (managed by the ICH7DH) are natively supported in the BIOS and can be used for boot devices.

The 4 ones connected to the Marvell RAID controller require a driver to work. This means they'll be reachable only when an operating system (you don't specifiy which one you use) loads the required driver.

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thanks i loaded the drivers – Mirage Jan 19 '10 at 12:48

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