Spinup Cycles (also called CSS, "on/off cycles" or "power cycles") is a value that hard disk manufacturers give for the average times a hard drive can spin up before it fails.
Usually server hard disks are specified for less spinup cycles than desktop hard disks, because servers are only very rarely rebooted. On the other hand server hard disks have much higher MTBF.
Famous quotes containing the word cycles:
“The stars which shone over Babylon and the stable in Bethlehem still shine as brightly over the Empire State Building and your front yard today. They perform their cycles with the same mathematical precision, and they will continue to affect each thing on earth, including man, as long as the earth exists.”
—Linda Goodman (b. 1929)