You can use Hard Disk Sentinel for that. It will give you the exact health status of each drive. Benchmark performance won't tell you the whole story because as a hard drive fills up with data, its performance decreases. So all the drives should be empty and even then each drive is different. Other drives have bigger RPMs, more cache memory, or bigger platters and all of these play a big role in the performance numbers that you'll get. So no you can't come to a conclusion about the health status of a hard drive, based on performance numbers alone.