When Intel® Rapid Storage reports volume has failed, it usually means no data and structure are available and you need to recreate RAID from scratch.
yea, but it's like nothing had happened - my laptop is working perfectly fine.
is there a diagnostic i can run to understand what is causing the error?
The Intel® Rapid Storage provides an option for verify and repair but this will work for different RAID levels. At this point, I recommend saving the volume data on another disk and run diagnostic out of the volume to check hard drive integrity using diagnostic tools from your hard drive manufacturer.