lcrooks wrote:
Apple engineers have provided data that shows regular shut downs actually prolong both computer and drive life.
Without knowing the context in which this statement was made, it should not be considered as a generality. A machine is not an animal nor a human being that gets tired from an effort and needs to recover. A machine is designed to run. Some machines are designed with a limited expected life time - MTBF as we say in the industry (Mean Time Between Failures). The pratice in the electronic components manufacturing is to design parts with the highest MTBF.
You should keep in mind that there is a greater risk in shutting down / powering up a machine : Thermal stress. Repeated heat-up / cool-down cycles are reducing the expected life time of a machine (lowering MTBF) considerably.
If you shutdown and restart your hard drives 10 times a day, you're killing them much faster than letting them spin 24/7. However, if your harddrive is not packged to dissipate the heat it generates, then a lengthy running time may cause abnormal wear because of a too high operating temperature. Computer rooms are "chilly". Need a jacket to get in.
On my desk is a 16 years old Pentium 2 Linux computer ... still humming with its original drives in. It's shutdown only when I move to another cubicule.
However, at home, we like that the family iMac becomes totally silent when not used by a family member. I now regret having upgraded it to Maverick lately.