I sought help from the manufacturer but the pdf manuals on my model had broken links.
System is a Dell XPS 410 running on Windows 7 64bit. Intel® Rapid Storage Technology is the OS application in use. My system is in a Raid 1 array, degraded to one hdd (the master drive: it's in the first motherboard port at least) and the second drive failed and has since been discarded. I want to "turn off" the raid without losing any data on the master (only) drive and continue to boot to the OS. In BIOS, all deletion options suggest I will lose all data, yet some have reported on other forums they retained their master drive's data. Even here http://www.intel.com/support/chipsets/imsm/sb/CS-022836.htm it notes that as long the master drive is present it will go unaffected.
I guess what I'm looking for is some reassurance because I don't have the hdd capacity to backup my master drive in case of failure or accidental deletion. Given that I've provided enough information, is it safe to do this?