JavaScript is disabled. In Mac OS X 10.5 and earlier, it is technically possible to use the pmset command to set disksleep 0 while setting the sleep argument governing idle sleep to a non-zero value. Or the opposite experiences? The disksleep argument of pmset specifies the minutes of inactivity after which the hard drive will sleep, i.e. Mac OS X (10.5.8), The energy required to do that does find its way into heat for the mechanism as a whole and stresses other components, like the controller in the drive. I've never considered checking the "let the drives spin down" box; equilibrium state is a good thing in almost any system you could encounter. In my own humble (or otherwise) opinion, the power use in a modern hard drive is so minimal that spinning it down does not make sense. In such a case the drive's Standby behavior cannot be changed. Disable all power management for the hard drive. But for a desktop or server system, no. In response to Dunestrider. May 10, 2011 11:26 PM in response to Dunestrider Power management in Mac OS X, such as hard drive sleep, is complex. This is one of the worst IT nightmare for restarting servers after a long shutdown! May 8, 2011 3:18 PM in response to Dunestrider One can contact the manufacturer of the drive or enclosure to see if a firmware update is available to improve its cooperation with Mac OS X power management. , Oct 19, 2013 3:10 AM in response to Dunestrider But is that really a good idea? Question: Q: Is putting the hard disks to sleep when possible a good idea? As I recall, the inrush current for induction motors of fractional horsepower size is 10 times or more that of the normal running current. Its never a good idea to let a hard drive constantly spin up and down, its the primary reason WD's "Green" drives have such an extremely poor lifespan compared to their "blue". Well if conservation of energy is a concern that I would think that just leaving it on Automatic for the performance setting. Readers wishing to learn more about this subject should consult the "Managing Power" chapter of the Apple® Developer Connection document I/O Kit Fundamentals. In my 25 years of experience with computers and hard drives, I've found that drives last longest if they rarely are allowed to spin-down. Click the Additional power settings link under Related power settings. I guess it has probably been checked since I originally set the computer up when I got it last year. All postings and use of the content on this site are subject to the. In a desktop it adds a second of lag waiting to restart it and the electrical savings is minimal. Chances are that the delay will drive you up the wall when it spins back up, and you'll be turning it right back off again. The systems that are up and running 24/7 with the drives powered the entire time tend to last 5-7 years and sometimes longer. Or have any experiences like mine? In response to Dunestrider. On the other hand, spinning any motor up to 7200 RPM repeatedly is not doing that motor and its associated circuitry any good. Oct 14, 2013 12:11 AM in response to Dunestrider I won't tell the story that scared the stuffing out of a class of EEs one time, except that we definitely learned the meaning of starting torque in a very dramatic fashion. And avoid using "green" drives that will power themselves down independently of your operating system's commands. In other words, the drive will enter Standby mode after ten minutes of inactivity. On my personal computers, I've always chose the option to "Put the hard disk(s) to sleep when possible". Does anyone know for sure? One KWH every 13-7/8 days of continuous operation, minus the extra energy consumed in the multiple spin ups. May 8, 2011 2:35 PM in response to Dunestrider, May 8, 2011 2:56 PM in response to BDAqua, May 8, 2011 3:18 PM in response to Dunestrider, User profile for user: Well, of course you can do this, but it'd be so much nicer to have it done for you, automatically. On my personal computers, I've always chose the option to "Put the hard disk(s) to sleep when possible". If you have a laptop, then that's different. When Put the hard disk(s) to sleep when possible is deselected in Energy Saver preferences, the value of the disksleep argument depends on the version of Mac OS X: Here 0 means never and 180 indicates 180 minutes three hours of inactivity. Power Mac G5 Dual 1.8GHz, May 8, 2011 3:49 PM in response to Dunestrider From this window, Click the Change plan settings link beside the power plan you wish to change. That shows how long the server has been running (at least 6 years); only replaced the hard drive on it once. Additional details about hard drive sleep are addressed in the "Hard Drive Sleep" chapter of our book, Troubleshooting Mac OS X. [2] This was documented in the source code for pmset at that time. Nov 21, 2014 1:44 PM in response to DieselFuelForLife I noticed on an "open house" at my alma mater a few years ago that they were using very small motors in the lab, as opposed to the seven and 10 HP motors we were using.
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