Hello, sir. Sorry for our delayed response.
As I know, in the case of the SD card, there is an SD controller. It's similar with the physical RAID card - it supplies the RAID feature to the SD card, while only providing the RAID virtual disk group 1. If one of them damages, you can receive an alarm notification on the BMC portal and you can directly replace the faulty SD card.
Then the SD controller would automatically finish the data construction.
Hope this helps.
Any other doubt, kindly let us know.