1.    11 Jun 2017 #1
    Join Date : Aug 2015
    Posts : 51
    Windows 10 Home (64-bit)

    Question regarding Fast Startup


    Hi, sorry if this is the wrong section.

    Recently I found out about the Fast Startup feature in Win8/10. (Aka hybrid shutdown)

    ( If you have no idea what I'm talking about: The Pros and Cons of Windows 10 Mode )



    My question is what would happen when you have a desktop with this feature enabled (by default), shut it down in this hybrid state, but afterwards completely cut it off from its power supply by pulling out the power cord from the wall socket. Doesn't the pc still need some source of power to maintain this hybrid shutdown? (Because it has stuff that isn't fully disabled but rather in a hibernation state) and does it have any detrimental effect?
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  2.    11 Jun 2017 #2
    Join Date : Dec 2015
    Posts : 6,011
    Windows10

    Hybrid sleep gets best of both worlds, instant recall from RAM if power is there, but recovers data from disk if RAM contents lost due to power outage.

    Just try it eg have a notepad session with some text open and do a hybrid sleep, remove power for a few minutes, then restart pc and actually see what happens.
      My ComputerSystem Spec
  3.    15 Jun 2017 #3
    Join Date : Aug 2015
    Posts : 51
    Windows 10 Home (64-bit)
    Thread Starter

    In other words, pulling the plug will turn the hybrid shutdown/fast startup into complete shutdown/cold boot and it's completely fine?
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  4.    15 Jun 2017 #4
    Join Date : Aug 2016
    S/E England
    Posts : 4,543
    10 Home x64 (1709) (10 Pro on 2nd pc)

    Quote Originally Posted by Sonar637 View Post
    In other words, pulling the plug will turn the hybrid shutdown/fast startup into complete shutdown/cold boot and it's completely fine?
    Not quite. On fast start up the system first looks for data in RAM. Pulling the plug would have destroyed that. The same data is stored in the hibernation file, so it can still do a fast start up by reading that back into RAM.
      My ComputersSystem Spec
  5.    15 Jun 2017 #5
    Join Date : Apr 2014
    Posts : 626
    Windows 10 Pro Insider Preview (14971)

    Quote Originally Posted by Bree View Post
    Not quite. On fast start up the system first looks for data in RAM. Pulling the plug would have destroyed that. The same data is stored in the hibernation file, so it can still do a fast start up by reading that back into RAM.
    Well, not quite. Fast Start only works with a complete shutdown, so on booting, there will never be anything useful in RAM. However, instead of having to reboot from scratch, and you having to reload programs and such, the system is restored to its prior state from a hibernation file. So it doesn't matter if you pull the plug or not. When Fast Start is enabled, hitting the Shut Down button is pretty much equivalent to hitting Hibernate.

    I don't think there is a 'hybrid shutdown'. There is 'hybrid sleep', though. To be clear:

    Hibernation = the current session is stored to disk, and the system is shut down and powered off, no power necessary to maintain the system 'snapshot'. Upon reboot, that snapshot is reloaded, with all of your work-in-progress right where it was when you left off.

    Sleep/suspend = the current session is stored to RAM. The computer is not turned off, but is put into a very low-power state to keep RAM alive and some other HW status maintained. If power is removed, the session is lost. When power is restored, you reboot from scratch.

    Hybrid sleep = the current session is stored to RAM and disk. If power not lost, 'waking' from sleep by restoring the RAM snapshot is very fast, just like regular sleep/suspend. If power is lost, waking from sleep means restoring from the disk image, a la Hibernation. Slower, but you haven't lost your session.
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