Well, SAS disk tend to go in failed state immediately or very quickly, most of the time without going first through the warning state. SATA disk are indeed gen

Well, SAS disk tend to go in failed state immediately or very quickly, most of the time without going first through the warning state. SATA disk are indeed generally more predictable failure-wise. Most issues are related to a failing head stack assembly. Rarely platter demagnetization for some disks (Toshiba laptop). Other failure issues are usually related to a friggin' manufactured firmware issue from Dell, HP or Lenovo corp.