Haven't installed a HD in 7 years .... most boxes wind up with 1 or more SSDs and 1 or more SSHDs for data storage. Couple of dozen SSHDs installed; newest is 2 years old, oldest is 7 no failures to date. Most boxes here are on 24/7 and Sleep is set to 60 minutes. Drives are designed for specific purposes and firmware designed accordingly. When you use the wrong type of drive in a specific environment, that's the worse thing you can do for your drives. In server situations, no sense using sleep .... similarly using a consumer drive in a server environment, can lead to prenmature failure as the very features that make it a good consumer drive, make it a poor server drive. In a consumer environment, independent of sleep the head parking feature may be employed which protects the drive from vibration when a desk is bumped for example. Drives are rated for between 250k and 500k parking cyccles and an a server environment, this can be used up in just 3 months. At 250k, if the heads park 120 times a day, it would use yp 250k cycles in about 5.7 years.