Hibernate Mode... You Must be

When you switch your laptop to hibernate mode, you are turning your computer off but saving everything you had up last while the computer was on. So when you turn it back on, the laptop will load up all the last work or whatever windows you had open before you enabled hibernate. As we all know when we restart our system, all the data that was present in RAM get vanished.

So how exactly this hibernate mode loads all the last work you had open before. In hibernate mode the current state of the system is saved in file called hiberfil.sys in your C drive and size of this file is around 1.5 Gb. Bydefault this file is invisible, if you want see this file

Goto folder options >> view >> choose show option and uncheck hide O/S protected files.

But I recommend you should always hide your O/S protected files.

So when you will choose hibernate mode your system will power down. When you will turn the system power back on, the saved information is read from the hiberfil.sys, restoring the last used settings.

What's the difference between sleep, hibernate, and hybrid sleep ? Sleep is a power-saving state that allows a computer to quickly resume full-power operation (typically within several seconds) when you want to start working again. Putting your computer into the sleep state is like pausing a DVD player—the computer immediately stops what it’s doing and is ready to start again when you want to resume working. Hibernation is a power-saving state designed primarily for laptops. While sleep puts your work and settings in memory and draws a small amount of power, hibernation puts your open documents and programs on your hard disk, and then turns off your computer. Of all the power-saving states in Windows, hibernation uses the least amount of power. On a laptop, use hibernation when you know that you won't use your laptop for an extended period and won't have an opportunity to charge the battery during that time. Hybrid sleep is designed primarily for desktop computers. Hybrid sleep is a combination of sleep and hibernate—it puts any open documents and programs in memory and on your hard disk, and then puts your computer into a low-power state so that you can quickly resume your work. That way, if a power failure occurs,Windows can restore your work from your hard disk. When hybrid sleep is turned on, putting your computer into sleep automatically puts your computer into hybrid sleep. Hybrid sleep is typically turned on by default on desktop computers. If sleep or hibernate aren't available, it might be for one or more of the following reasons:

• Your video card might not support sleep. Update the driver for your video card, or check the information that came with your computer about your video card and supported drivers.
• Some settings are managed by your system administrator.
• Sleep and other power-saving states are turned off in your computer's basic input/output system (BIOS). To turn on sleep, restart your computer, and then enter the BIOS setup. As your computer starts, instructions typically appear on the screen that indicate which key or keyboard shortcut you must press to enter the BIOS setup process. Because not all computer manufacturers use the same BIOS, different keys are assigned for this purpose. To learn more, check the information that came with your computer or go to the manufacturer’s website.
• If the hibernate option is missing, you might have hybrid sleep turned on. 
  
  
  How can i prevent my Computer from Automatically sleeping or Hibernating ?
  You can adjust how long your computer waits before sleeping or hibernating—or prevent it from turning itself off altogether. But be careful. On a battery powered laptop, inhibiting sleep or hibernation can result in data loss if the battery dies. Here's how to prevent your computer from entering a power-saving state :
  1. Open Power Options by clicking the Start button , clicking Control Panel, clicking System and Security, and then clicking Power Options.
  2. On the Select a power plan page, click Change plan settings next to the selected plan.
  3. On the Change settings for the plan page, click Change advanced power settings.
  4. On the Advanced settings tab, double-click Sleep, double-click Sleep after, and then do one of the following:
     • If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
     • If you're using a desktop computer, click Setting, click the arrow, and then click Never.
  5. Double-click Hibernate after, and then do one of the following:
     • If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
     • If you're using a desktop computer, click Setting, click the arrow, and then click Never.
  6. If you also want the display to stay turned on, double-click Display, double-clickTurn off display after, and then do one of the following:
     • If you're using a laptop, click On battery or Plugged in (or both), click the arrow, and then click Never.
     • If you're using a desktop computer, click Setting, click the arrow, and then click Never.
  7. Click OK, and then click Save changes.
     Sleep requires an extremely small amount of power. If your laptop battery charge gets critically low while the computer is asleep, Windows automatically puts the laptop into hibernation mode.
     
     

     What is hiberfil.sys and How Do I Delete It?

     
     
     
     

     There’s a gigantic hiberfil.sys file sitting in the root of your drive, and you want to get rid of it to free up some space… but you can’t!

     Luckily, you actually can delete it.

     

     The more memory you have in your PC, the bigger the file will be.

     What is hiberfil.sys ?

     Windows has two power management modes that you can choose from: one is Sleep Mode, which keeps the PC running in a low power state so you can almost instantly get back to what you were working on. The other is Hibernate mode, which completely writes the memory out to the hard drive, and then powers the PC down entirely, so you can even take the battery out, put it back in, start back up, and be right back where you were.

     Hibernate mode uses the hiberfil.sys file to store the the current state (memory) of the PC, and since it’s managed by Windows, you can’t delete the file.

     

     So if you never use it, and want to disable Hibernate mode, keep reading. Personally I stick with Sleep Mode the vast majority of the time, but I do use Hibernate quite often.

     Disable Hibernate (and Delete hiberfil.sys) in Windows 7 or Vista

     You’ll need to open an administrator mode command prompt by right-clicking on the command prompt in the start menu, and then choosing Run as Administrator. Once you’re there, type in the following command : 

     "powercfg -h off"

     You should immediately notice that the Hibernate option is gone from the Shut down menu.

     

     
     

     Disabling Hibernate Mode in Windows XP

     It’s a lot easier in Windows XP to get rid of Hibernate mode. Just head into Control Panel –> Power Options, and then find the Hibernate tab.

     

     Uncheck the box, reboot your PC, and then you can delete the hiberfil.sys file.