Unraid will only disable a disk if a WRITE to it fails.
As was mentioned CRC errors are connection related and are very rarely a genuine disk issue. They only cause a retires to occur and as long as a retry succeeds then things continue otherwise unaffected. One thing to be aware of with CRC errors is that there is no way to set the count back to 0 - it can only increase, so if it stops increasing after taking some rectification action that is all you can expect.