Mac Os Prevent Sleep
Prevent Hard Drive From Sleep Mac App Store

Keep your drives alive. Installer Portable. Release Date: January 27, 2021. Version: 4.2 ( Version History) Modern hard disks are set to automatically enter sleep mode (also known as idle time) whenever file operations are no longer happening. This is a method that is supposed to help with cooling the physical disk and prolonging its lifespan. Prevent hard drives from entering sleep mode by automatically creating empty text documents at a given time interval using this simple app What's new in NoSleepHD 2.0: Monitor multiple drives at once. How to use Energy Saver preferences to keep your Mac from sleeping. Open System Preferences by navigating to the Apple icon in the top left menu, selecting the System Preferences icon in your. Prevent hard-drives from going into sleep mode. Contribute to stsrki/KeepAliveHD development by creating an account on GitHub.

Hard drive sleep

To conserve energy, hard disk and optical drives are designed to spin-down after a specific period of inactivity. This is usually referred to as hard drive sleep, but the technical term is Standby mode.

Mac Os Prevent Sleep

In Standby mode, a hard disk drive is in a state of low energy consumption and its platters have ceased to spin. It is awaiting a read or write instruction — such as opening or saving a file — at which time the drive will spin-up its platters — wake up and enter Active mode — to perform the operation. Some drives take many seconds to spin up and switch from Standby to Active mode.

If you access a disk that is in Standby mode, such as by opening or saving a file, you may see the spinning wait cursor — aka the Spinning Beach Ball of Death (SBBOD) — while its platters spin-up and the disk switches to Active mode.

One might think that de-selecting Put the hard disk(s) to sleep when possible in Energy Saver preferences would prevent hard disks from ever sleeping. This actually depends on the version of Mac OS X you are using.

Energy Saver preferences are a Graphical User Interface (GUI) to the pmset Terminal command, used to modify power management settings. The disksleep argument of pmset specifies the minutes of inactivity after which the hard drive will sleep, i.e. enter Standby mode. [1]

When you select Put the hard disk(s) to sleep when possible in Energy Saver preferences, behind the scenes a pmset command is issued with the argument disksleep 10 where 10 Champion sprinkler valve manual. indicates ten minutes of inactivity. In other words, the drive will enter Standby mode after ten minutes of inactivity.

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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:

Mac OS X Version:	disksleep argument:
Mac OS X 10.6 or later	`disksleep 0`
Mac OS X 10.5 or earlier	`disksleep 180`

Here 0 means never and 180 indicates 180 minutes — three hours — of inactivity.

In Mac OS X 10.6 and later, this means that the hard drive will not spin down unless the Mac itself either enters idle sleep or is put into sleep mode.

In Mac OS X 10.5 and earlier, the hard drive will spin down after three hours of inactivity, even if Put the hard disk(s) to sleep when possible is deselected. This option works in this way to assure computer (idle) sleep works as expected in these earlier versions of Mac OS X. [2] To prevent hard drive sleep via Energy Saver preferences in these versions of Mac OS X, one must deselect Put the hard disk(s) to sleep when possibleand set computer sleep (Put the computer to sleep when it is inactive for) to Never.

Another undocumented aspect of Put the hard disk(s) to sleep when possible is that this option generally applies only to the startup disk. Non-startup hard disk drives — external FireWire® or USB® drives or additional drives installed in a Mac desktop — may ignore this setting. Consequently, you may see the SBBOD when accessing a non-startup drive, despite having deselected Put the hard disk(s) to sleep when possible, for two reasons.

First, under Mac OS X 10.5 and earlier, deselecting Put the hard disk(s) to sleep when possible will still result in non-startup drives spinning down after three hours of inactivity.

Second, some non-startup drives simply ignore the setting of Put the hard disk(s) to sleep when possible and spin down on their own schedule. This appears to be a function of either the drive itself or, in the case of external drives, the firmware or chipset employed in the drive's enclosure. In such a case the drive's Standby behavior cannot be changed. 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.

Power management in Mac OS X, such as hard drive sleep, is complex. Readers wishing to learn more about this subject should consult the 'Managing Power' chapter of the Apple® Developer Connection document I/O Kit Fundamentals.

Additional details about hard drive sleep are addressed in the 'Hard Drive Sleep' chapter of our book, Troubleshooting Mac OS X.

Notes

[1] In Mac OS X 10.4 and later, disksleep replaced spindown as the pmset argument specifying the minutes of inactivity before hard drive sleep in Mac OS X 10.3 and earlier.

[2] This was documented in the source code for pmset at that time. 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. However, the pmset command will issue a warning that System sleep (idle sleep) may not behave as expected. For example, the following command sets hard drive sleep to never (disksleep 0) and System sleep to occur after 20 minutes of inactivity (sleep 20):

Issuing that command in Terminal under Mac OS X 10.5 and earlier results in the alert highlighted in the following screen shot:

After recently upgrading my Plex Windows 10 machine, I had an issue where I couldn’t prevent hard drives from going to sleep on that system. After the system restarted, a few hours later I would get an email from Stablebit Scanner indicating that one or more of my drives were no longer connected.

Prevent Hard Drive From Sleep Mac App Store

With the exception of the system drive, all other drives connected to the system were USB-connected external hard drives. I couldn’t connect to the drives, and the lights on the drive casing indicated that they were in sleep mode.

I hadn’t experienced anything like this since I setup the system over one year ago. After some investigation I found out that there are actually several settings, in two locations, in Windows 10 that I needed to change in order to prevent the hard drives from going to sleep.

I detail the steps below.

Changing the power plan

The first setting I had to change was the USB suspend setting in the Windows 10 power options. This does require an administrator to change, but you will be prompted to enter the administrator password if you are logged in as a standard user.

Click Start->Settings->System->Power & Sleep to display the options to cha