Spinup cycles
From Wikipedia, the free encyclopedia
Spinup Cycles (also called CSS, "on/off cycles" or "power cycles") is a value that harddisk manufacturers give for the average times a harddrive can spin up before it fails.
Usually server harddisks are specified for less spinup cycles than desktop harddisks, because servers are only very rarely rebooted. On the other hand server harddisks have much higher MTBF.