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Difference in sleep and hibernate

  1. #1
    Platinum Member Preeti_20's Avatar
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    Default Difference in sleep and hibernate

    I use my laptop on a regular basis throughout the day, and I hate having to keep turning it on and off. So I thought it would be good to put it into either sleep mode or hibernate. But whats the difference in the two modes?

  2. #2
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    Im not too sure either, but I think when you put a computer to hibernate the hard drive is still working, and on sleep its turned off......Im not too sure but I think its something of this sort or similar.

  3. #3
    Platinum Member Preeti_20's Avatar
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    You know thats what I thought, but I wasnt sure, I wanted to make sure so that I know Im choosing the right command when not using my laptop for an hour or more but want it still to be on. Hopefully will get a correct answer from of the people who know more about these modes.

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    let me explain what shutdown is before going ahead.
    when you shutdown, all active applications are closed, background processes are terminated, and windows turns off the hardware one by one, the last of which is the ACPI (power).

    in sleep mode, your computer is on, however, the hard-drive, GPU are put to sleep. the cpu does not sleep. this is evident since pressing any key causes a wake up event. so, its just like sleeping. information is retained in the RAM, since immediately after waking up, the computer can access all the stuff which was resident in the memory immediately (os, running programs, etc). If you turn off a sleeping computer it will lose its sleeping state, immediately after power is turned off or for a laptop, after its battery runs out.

    in hibernate, the ram is synced with a file on your hard drive called as hiberfil.sys. when you give the command to hibernate, the ram content is committed to this file, and the computer turns off the hardware. however, after resuming, just like wake up, the entire windows session including running programs etc is loaded from the hiberfil.sys, so boot up is very speedy.
    the difference is that, in hibernate, if the power is turned off, or battery removed or battery runs out, the state is not lost since it is stored in the said file.

    for power saving, hibernate is best since you can actually switch off the computer after it has hibernated. in case you are going for a break for 10-15 minutes, and sleep mode is better.

    remember that since entire ram is committed to a file, the hiberfil.sys is exactly equal to the size of your RAM. it takes up that much space on your drive just to enable that feature of hibernation.
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  5. #5
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    You will have problems in battery when you put your laptop in 'sleep' , better put it in hibernate mode when you close the lid. It will take more time to resume but your battery will not be drained.
    Just Google "battery drain and sleep in laptop" and you will see so many hits !
    Preeti_20 likes this.
    Regards,
    Shrinivas

  6. #6
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    Hi,

    Both are power saving modes.

    Sleep Mode: Sleep mode(standby) is a power saving mode. It is something like pausing DVD movies. As soon as System goes into sleep mode all action on computer are stopped and any open documents and application are put in memory you will not loose your unsaved data and will not close any open stance of program. It is mailny used for when you want to stop working for short period of time. Like going for breakfast, a loop break etc.

    Hibernate Mode : It is also power saving mode. But consume almost zero power when you put your system in this mode.Actually hibernate mode save all your data and open application into hard disk and shutdwon the computer. This is best suited in a situation when you are away from your PC for quite long period of time.
    This can be one of the senario- Lets assume you are working on many application, you have open unsaved documents , Open tens of page in your web browser, watching movies, palying games etc. But suddenly you have to go away from your system for long period of time or you become tired want to sleep or want to give some rest to your System, but same time you don't want to close any of these open instanse of applications.
    You can do all this by putting your system in Hibernate Mode. When you resume your system after pressing power button your system will be on same state as where you had left it. This is best paractice for Laptop Computer. Specially while you on walk using battery as a power sourse.


    Note : In hybernate mode system create a file " hiberfile.sys" which is located in root directory. It has the same size as of your RAM. This is the file where you system store copy of memory into hard disk. This can be problem for low hard disk system.

    Hybrid Sleep Mode: It is a combination of Hibernate and Sleep Mode. It is best suited for Desktop Computer.

    Below are comparision of different mode

    1. Based resume timing.

    Restart> Hibernate Mode > Hybrid Sleep> Sleep

    2. Based on power consumption.

    Running Computer> Sleep> Hibrid Sleep> Hibernate~Shutdown

    In short Hibernate Mode take less power ( almost zero as shutdown) than Sleep Mode. But it will take more time to resume( but less than resatrting the system) than sleep mode.

    Thanks
    Preeti_20 likes this.

  7. #7
    Platinum Member Preeti_20's Avatar
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    Thanks everyone for the detailed information.

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