Are these SATA controllers on PCI or PCIe slots? If it was me, I'd put the new controller along side the 2 channel, get it fully installed in the OS then shut down and move the HD to the new controller.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250