WRITE + read test: It overwrites the disk surface and then reads back sector contents.You will lose all the data if you run this test. WRITE test: This will overwrite the disk surface to analyze the problematic sectors and fix them by reallocating the bad sectors.Read test: When you run this test, HDSentinel will read the disk surface to check if all sectors are accessible and readable.Tip: The Surface Test is available only after registration and activation.
