Reliability Refers to the dependability of individual components of a system.
Adding hardware can therefore improve availability but it can NOT improve reliability . Individual process-request seek latencies can be overlapped in time. However, latency for small requests is not improved because it still takes all of the usual latency to get to a randomly selected block. In disk arrays, the data from files can be striped across several disks. This increases bandwidth by allowing a file to be read from more than one disk at a time.