Hard drive damage in RAID
RAID 0
Since RAID 0 has no redundancy, data that can't be read is lost.
RAID 1
If during the recovery of the failed RAID 1 it is discovered that one of the member disks is bad, you need to determine which disk is healthy and use this disk in the recovery. If both disks are damaged, then you should try to read and combine data from both. Sectors that are damaged on both drives are lost irreversibly.
RAID 5
If only one of the member disks is damaged, it would be better not to use it in the data recovery. The RAID recovery software can synchronize disk head movement when reading data - as it is implemented in ZAR and ReclaiMe Free RAID Recovery. In this case, parity data reconstruction would be faster than waiting for a response from the disk with bad sectors.
RAID 10
This RAID type consists of two identical stripe sets. If one or more disks fail, it is necessary to have at least one full stripe set for the recovery. Therefore, you need to determine which disks have been damaged and do not use them. If a full stripe set is still available after the damaged drives are excluded, just recover data as for RAID 0. If you can't get a full stripe set, you need to connect failed disks and see what it brings. If this doesn't help, you can't recover the array data at home.
Continue to Multiple disk failures.