We have a C7SIM-Q board and use the onboard sata raid. We also connected a Samsung SH-S223C DVD drive. It takes a very long time when starting for the system to recognise the Samsung SH-S223C DVD.
This is a firmware issue of your dvd drive. Please update the dvd drive firmware: Samsung DVD Firmware downloads
http://www.samsungodd.com/eng/Firmware/FWDownload/FWDownload.asp