For example, there may be insufficient disk space on the C: drive to create this huge file, or some older Bios software cannot manage suspend to disk or suspend to RAM. ![]() If you figure out the role of Microsoft's hiberfil.sys, then you understand why Hibernation sometimes is not an option. Select the radio button next to Show hidden files and folders. Press the Alt key, then click on the View tab and now scroll down to Hidden files and folders. When the machine restarts, it loads the data stored in hiberfil.sys and thus returns the machine to the precise state when you set it to hibernate. Incidentally, hiberfil.sys is a hidden file, which is always found in the root of the c: drive. To see the file, you may need to adjust your Explorer's settings. This means that your data is safe even if you switch of the mains and take out the battery. Windows 7's Hibernation stores unsaved data, including information about open programs, to a special file called hiberfil.sys. See 'Require a password on wakeup' from the task list menu. You may also have to re-enter your password to resume after sleep, however that is another configurable setting. The disadvantage is a 5 second delay while Windows 7 manages the switch back to normal power mode. In the event of a power failure you would lose any unsaved data which is stored in RAM. Windows 7's Sleep saves data to memory (RAM) and then switches to minimal power mode. As with all task's, micro-management is counter-productive, in the case of the laptop you have to balance the hesitations from coming out of 'Sleep', with the battery wastage when you get up from the laptop in order to perform some other task in the room. ![]() Therefore, anything that I can do to conserve battery power, will increase the time I can use my laptop away from the mains electricity. ![]() If I work with the Aero graphics at maximum brightness, my AS4741G's battery will not last much more than 90 minutes. Hibernate on the other hand, saves the contents of memory into a physical file called hiberfil.sys, thus you would not lose unsaved data.One more point, Windows 7 has a setting called 'Hybrid sleep', which combines sleep and hibernate as described above. The downside of Sleep is that you lose unsaved data in the case of a complete power loss, this is because the information is stored in RAM.
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