I am repeating a comment to another response but if you reduce the access time and at the same time increase the amount of data stored on the drive, you are locking yourself out of your data. Which is fine if it is just for archival. But if it is data supposed to be randomly accessed (youtube video) it doesn't help to have 100TB of data on a drive if you can only extract them at a single 50MB/s at a time. The more data on a single drive, the most likely you will a need to access several segments of this data at the same time.