Redundancy means uptime, in case of drive failure the system stays up & running. Raid 0 being a special case which offers speed but no redundancy.
Since windows 10 Home does not have a "Mirror" function and judging by your description it appears you used raid 0 or stripped and not raid 1 and you will need raid recovery software. If there is to be any chance of recovery the failed disk needs to actually be in good working condition because half of every byte of data is stored on it (the other half of the byte is on the other disk).
Run the trial version of
Zero Assumption Recovery just to see if it can detect the drives and let you know if there is some data to recover. There are other free tools that can work if data is recoverable; testdisk and linux's mdadm are the two I use. Neither of these are simple windows point and click so I like to start people with zar to see if its even worth going further.
ps - I will not be on tomorrow.