How to Enable or Disable Hibernate Option in Windows 7
First, let me tell you what hibernation actually is. Hibernation is a state of saving the power created for laptops specifically. While the ‘Sleep' option stores your settings and tasks in memory and draws very little power, ‘Hibernation' option stores your open programs and the documents in the hard disk and switches off the system.
Among the states of power saving, Hibernation uses very less power. So, when you are using your laptop for a short period, make sure to use this option so that the battery will last for a long time. To Enable/ Disable the option ‘Hibernate' in Windows 7, apply these steps.
To enable ‘Hibernate' option in Windows 7:
Step 1: Hit ‘Windows' key and the alphabet ‘R' simultaneously and then type ‘cmd' in the window ‘Run.'

Step 2: Type this command "powercfg -h on" in the command window and press ‘Enter.'

Step 3: Click on the ‘Start' button in the menu ‘Shutdown' and check whether the option ‘Hibernate' is present or not. If the option is absent, you have to do a few extra steps.

Step 4: Now, again click on ‘Start' button and type ‘Power Options' in the search dialog box. Next, click on the icon ‘Power Options.'
Step 5: Now, click on ‘Change Plan Settings' in front of the chosen plan.
Step 6: A window appears. Click on the option ‘Change Advanced Power Settings.'
Step 7: A new window comes to view. Extend the menu ‘Sleep' and choose ‘Off' from the icon ‘Allow Hybrid Sleep Setting.'
To disable ‘Hibernate' option in Windows 7:
Step 1: Hit ‘Windows' key and the alphabet ‘R' simultaneously in the window ‘Run.'
Step 2: Type this command ‘powercfg -h off' in the command window and press ‘Enter.'
source : http://www.dungz.com/to-hide-the-hard-disk-partition-logical-partition-from-my-computer-in-windows-7.html/
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