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Vermutlich falschen Treiber mitinstalliert:
If you have not connected any serial ATA device to A7N8X, please do not install the Silicon Image serial ATA utility. If you want to connect the serial ATA device with A7N8X, please follow the steps below: 1. Connect the serial ATA devices. 2. Install Silicon Image serial ATA utility from support CD. 3. If you need to remove or disconnect any serial ATA device, please uninstall Silicon Image Serial ATA Utility first.
(Auszug vom Asus Support)