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I had a couple SATA hard disks in a RAID 1 array. I reset them to non-RAID in the Intel raid manager, and removed one drive.

Despite the raid controller saying it's not a RAID disk, and even disabling RAID from the BIOS setup, it still appears as a RAID disk in the boot menu (pictured).

old RAID disk still shows as RAID

In its current state, I am unable to install Windows on it as windows setup is not able to create a partition. How do I totally reset it to a non-RAID disk?

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It's not telling you that it's a RAID disk. It's telling you the disk is connected to the RAID controller. – Oliver Salzburg Jul 2 '12 at 17:29
up vote 4 down vote accepted

This is because you have the set the "Disk Controller" (or similar) in your BIOS to RAID (usual options are IDE, SATA, RAID). Change it back to SATA. Note that this will no longer invoke the Intel RAID Manager on boot.

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Ah, you're right. I had only disabled the extra RAID controller. I also needed to set the RAID mode to IDE instead of RAID in the "On-Chip ATA Devices" submenu. – hughes Jul 2 '12 at 17:34
+1 this is absolutly what I was starting to type as answer. – Diogo Jul 2 '12 at 17:35

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