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Thu, Apr 12, 2012 10:39 pm

Mac OS X Hibernate Mode

Mac OS X provides a hibernation feature, which allows you to save the current state of the system to memory or the hard drive. You might wish to use this feature if you are going to be away from the system for awhile and don't want to close all of the applications you have open or you can't power the system from a wall electrical outlet and wish to conserve battery power.

OS X supports five different hibernate modes. The default mode is "3", which means when you put the system to "sleep" it saves the current state of the system to Random Access Memory (RAM), blanks the display, and goes to a low power consumption state.

You can determine the current hibernate mode by opening a Terminal window (use the Finder to go to Applications then Utilities then double-click on Terminal) using pmset -g | grep hibernatemode.

$ pmset -g | grep hibernatemode
 hibernatemode	3

You can change the hibernation mode by using sudo pmset -a hibernatemode n where n is one of the above integers representing a supported hibernation mode. E.g., to write the current state of the system, which includes the open applications and files in memory, to the hard drive and completely shut down the system, you can set the hibernatioon mode to 1. This is akin to hibernate mode on a Microsoft Windows system.

$ sudo pmset -a hibernatemode 1
$ pmset -g | grep hibernatemode
 hibernatemode	1

To put the system in hibernation, you can click on the Apple icon in the upper, left-hand corner of the screen and select Sleep. The system will then be put in the selected hibernate mode.


  1. Does Mac OS X support hibernation?

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Thu, Apr 12, 2012 9:50 pm

Copying a Disc with Burn under Mac OS X

The Disk Utility application that comes with Mac OS X, at least as of OS X 10.6 ,aka Snow Leopard, does not permit one to copy an audio CD. An alternative application that can be used to create an .iso file from an audio CD is Burn, which is free software licensed under the GNU General Public License (GPL) .

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