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Which power-saving mode in Windows saves open documents to the hard drive and turns off the computer completely?
Sleep
Hibernate
Standby
Lock
Hibernate
Hibernate is a power-saving state that writes the current contents of the system memory (RAM) to a dedicated file on the non-volatile hard drive (hiberfil.sys) and subsequently cuts all power to the computer. This allows the user to resume exactly where they left off without losing data, even if power is completely removed.
ACPI 6.5 (Advanced Configuration and Power Interface) Specification
Hibernate is a power-saving state that writes the current contents of the system memory (RAM) to a dedicated file on the non-volatile hard drive (hiberfil.sys) and subsequently cuts all power to the computer. This allows the user to resume exactly where they left off without losing data, even if power is completely removed.
Power┬аConsumptionHibernateтАЛтЙИ0┬аWatts
Restoration┬аTimeтИЭDisk┬аWrite┬аSpeedData┬аin┬аRAMтАЛ
When Hibernation is initiated, the OS kernel copies the data stored in volatile memory (RAM) into the hiberfil.sys file on the hard disk. The system then signals the power management unit to transition to the G3 (Mechanical Off) state under the ACPI specification. Upon reactivation, the BIOS/UEFI bootloader detects the presence of the hibernation file, loads the data back into RAM, and restores the system state.
Hibernate uses zero power after completion, unlike Sleep mode which maintains power to the RAM.
The required disk space for hibernation is typically proportional to the total installed RAM capacity.
It is the safest mode for long-term power disconnection during work sessions.
Uses a dedicated file named hiberfil.sys on the system root drive.
Retains all open applications and documents without power usage
Prevents data loss during prolonged power outages
Saves battery life completely for laptops
Requires significant hard drive space for the hibernation file
Resumption time is slower than Sleep mode due to disk-to-RAM transfer
Not ideal for frequent, short-term breaks
Long-term storage of system state
Transporting laptops for long durations
Saving battery when power sources are unavailable
| Feature | Sleep | Hibernate |
|---|---|---|
Power State | Low power (RAM refreshed) | Zero power (Disk storage) |
Data Persistence | Volatile memory | Non-volatile storage |
The ACPI standard defines global power states S0 (Working), S1-S3 (Sleep), and S4 (Hibernate).
Sleep (Standby) keeps the RAM powered, making resume very fast but susceptible to battery drain.
Lock simply secures the user interface while the system remains in S0 (Working) state.
B is correct тАФ Hibernate saves the entire system state into non-volatile storage and enters a full power-off state.
When answering OS questions regarding power, differentiate based on memory volatility: Sleep uses volatile RAM, while Hibernate uses non-volatile Disk storage.
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