My configuration consisted of a 1TB drive containing Ubuntu 16.04 and a Raid 1 array of two 4TB drives. I erased the existing drive of Ubuntu 16.04 and installed 20.04. the two 4TB drives now show up on /dev/sdb and /dev/sdc and as "Linux RAID member" without any md1 entries.

I'm very new to Linux. Please help. The RAID array contains valuable information.

Thank you