![]() ![]() However, all my hard drives honor the 'spin down when possible' option & spin down when it is enabled, & none spin down when it is not. I do not know of any Apple documentation about this. The additional (s) on hard disk does indicate that it is meant to work for more than 1 disk. But I also see that in Energy Saver > Put the hard disk(s) to sleep when possible" is not check marked. I've been using a pmset 0 and none of my externals have spun down since setting it a couple of years ago. ![]() But if pmset does not have any more "glue" than the GUI way, then it's not the solution I thought. I thought it a better way to allow no spin down than the GUI which is iffy. "sudo pmset -a spindown 0" is no different from unchecking the "Put hard disks to sleep when possible" Do you know of a kb article or anything else that deals with this? However, I can't find anything to dispute what you say, nor can I find anything to support it. My main point of contention was about your "only an option for your system disk" comment, which isn't true - many if not most "non-system" drives, internal & external, do honor the spin down command when issued by the OS. IOW, the only way to guarantee that a HD with this feature will remain spinning is to access it frequently enough to prevent its timer from reaching zero. (Oddly, using the Developer utility does not update the Energy Saver checkbox & visa versa, nor does its spin down setting always survive a restart or even a computer sleep/wake event.)Īnyway, since this command has no more of an effect on a drive with a non-defeatable internal spin-down timer than does the Energy Saver preference, it still would be necessary to experiment with the interval a "do nothing" process would have to access that drive to keep it awake. And if you check or uncheck that preference, it overrides any value that command has set, replacing it with the 10 minute or zero "never" default values respectively. "sudo pmset -a spindown 0" is no different from unchecking the "Put hard disks to sleep when possible" Energy Saver preference (& immediately updates that checkbox to reflect that). The "BTW" addition was just added for completeness, not to make you, uh, any wronger. *This will require some experimentation to determine its internal timer value* If you have such a drive, the only way I know of to keep it spinning is to write some "do nothing" application that periodically fetches some file data from it, perhaps as an Applescript app. I said *about 15 minutes,* so you really want to make me wrong over 5 min.? or should I have said *has little effect over other drives?*īTW, *the default delay is 10 minutes of inactivity, not 15.* The option applies to all drives *however, many ignore the spin down command from the OS & spin down according to their own internal inactivity timers.* There is nothing you can do about this unless the drive's maker provides some way to defeat this proprietary feature. This will require some experimentation to determine its internal timer value & probably isn't a good idea to begin with since it will use a small amount of system resources & keep the drive spinning unnecessarily. However, this does not let you control drives individually nor will it force a drive to override an internal timer if it has one. SpindownHD.app (by default, installed in the Developer/Applications/Performance Tools/CHUD/Hardware Tools/ folder) to monitor the energy state of each drive attached to the Mac (even the optical drive), & to see or to set the global spin down timer delay to another value. ![]() If you have installed the CHUD option from the Developer package, you can use There is nothing you can do about this unless the drive's maker provides some way to defeat this proprietary feature.īTW, the default delay is 10 minutes of inactivity, not 15. ![]() The option applies to all drives however, many ignore the spin down command from the OS & spin down according to their own internal inactivity timers. All drives spin down after about 15 minutes of inactivity. "Put hard disks to sleep when possible" is only an option for your system disk. ![]()
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