![]() If I load up CrystalDiskInfo, a tool we recommend in our guide to checking your HDD and SSD health, and check the Total Host Writes, the Power On Count, and the Power on Hours, I can get a sense of how much data is being written to the disk per day and what percentage of that data is from hibernation. ![]() Outside of occasionally using the "update and shutdown" option or shutting down the PC to swap parts or take photos for a tutorial, I always hibernate it. I'm a great candidate for this showcase because I hibernate my PC daily like clockwork. But if you want the long answer, let's crunch some numbers.Īgain, I'll use my daily driver machine to showcase things. Yes, it clearly adds wear and tear to the disk because you're writing extra data every day that you wouldn't otherwise write to the disk, but what does it mean relative to the lifespan of the disk? The quick answer: it doesn't matter. The million-dollar question (or at least the $300 question if you're trying to avoid replacing a premium SSD) is whether or not the extra writes matter. Here's Why It Doesn't Really Matter That Much Our file is 13.39GB which lines up nicely with our estimated 13.5GB value. Want to double-check that under real-world conditions? The next time you bring your PC out of hibernation, check the file size of the hiberfil.sys file located on your C:\ drive. If you have similar RAM utilization levels but only 16GB of RAM, you'll likely write about 6-8GB of data per hibernation event when you account for the compression. So, on average, every time I hibernate my Windows PC, I write about 13.5GB of data to the SSD. So our 18GB or so of RAM utilization gets mashed down to about 13.5GB before it's written to your disk. That's because since Windows 7, when Windows writes the hibernation data to disk, it applies a compression algorithm that reduces the file size. Once you have the value, in my case about 18GB, you have one last step. The manual calculation and memory performance check both show my system is using around half the available RAM. The third step commences if the PC remains undisturbed in hybrid sleep for long enough: The sleep mode portion terminates, and the PC then enters full, standard hibernation.The RAM utilization fluctuated a small amount between screenshots, but you get the idea. This way, the PC can wake up instantly (like standard sleep) but with the robustness of hibernation, in that a power-loss or total shut down won’t cause trouble (because all data is safely stored in the hibernation file on the hard drive). But in the second step, instead of shutting down completely, the PC then goes into sleep mode. First, when hybrid sleep commences, the system prepares as if it were going to hibernate the RAM and CPU contents are fully written to the hard drive. Hybrid sleep combines standard sleep and hibernation in a three-step process. Hibernation is more robust than sleep because the PC is totally off: Even if you unplug the PC or remove its battery, the data is safe on the inert hard drive. But when the PC fully re-awakens, it can pick up from where it left off. ![]() Because this usually involves manipulating several GB of data, this process is not instantaneous - it usually takes at least a few seconds. When a PC awakens from hibernation, Windows uses the contents of the hibernation file to put the system RAM and CPU back into the exact state they were in when hibernation began. Hibernation writes the entire contents of RAM and the exact state of your PC’s CPU into a hidden hibernation file on the hard drive then the PC shuts off completely. The downside to standard sleep is that if anything interrupts the power supply to the sleeping PC, the contents of RAM (including any unsaved files) will be lost, and the PC will not be able to resume normally upon wake-up. The major advantage of standard sleep mode is that, when the PC wakes up, it can pick up from where it was almost instantly. In sleep mode (sometimes called suspend), your PC goes into a low-power state, consuming just enough electricity to keep the RAM contents intact to monitor for system events (such as a key- or mouse-click, or closing the lid on a laptop) and to run similar low-power processes.
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