Switching SATA Mode from RAID to AHCI

So I tried it as I described and no BSOD's. One can switch from SATA ATA to SATA AHCI by first editing the msahci start value to 0 before changing the BIOS and booting. Switching back to ATA doesn't seem to require anything but changing the BIOS settings. At least that's how it worked for me. BTW, ahci mode doesn't seem to show a noticeable performance change.
 

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At a glance

Win 7 ProfessionalIntel4 GBRadeon HD 3400
Computer Manufacturer/Model Number
Dell Optiplex 380
OS
Win 7 Professional
CPU
Intel
Motherboard
Intel
Memory
4 GB
Graphics Card(s)
Radeon HD 3400
Sound Card
Realtek HD
Monitor(s) Displays
Dell 24-inch
Hard Drives
2 x 500 GB
PSU
250 watt
Case
yes
Cooling
fans
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