System hangs during boot (SATA softreset failed, exception)

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https://bbs.archlinux.org – Ever since I installed Arch on my machine, it keeps hanging during boot while showing me errors that seem to be related to the CD drive. This never happened while running Ubuntu, so I guess this is a configuration issue. However, I was not able to find a solution that worked for me. I already tried to disable AHCI but it didn't change anything.Any idea what is wrong here and how I can fix it? This causes a delay of about 20 seconds at boot, so it is kind of annoying. My machine has a AMD SB600 controller.Below is the relevant output of dmesg, Arch is showing me the part at 33.x during sta (HowTos)