Ensure your computer is completely powered down before transferring files to the internal hard drive.
Ensure your computer is completely powered down before transferring files to the internal hard drive.
By default, when you power off a Windows 8.1+ machine, it activates a function known as "Fast startup," which puts the system into hibernation after closing applications. This can be helpful for older hard drives because Windows doesn’t have to reload everything from the beginning, though it might slow down SSDs. The issue arises when the computer remains in hibernation mode; Windows not only stores RAM data but also needs to save a cache of the drive. I’ve observed this problem firsthand—files would disappear after a restart, even if they looked present before. Sometimes moving files to the drive during shutdown failed completely. Disk space usage appeared normal until a disk error repair was performed, at which point the issue reappeared. Occasionally these files show up in numbered folders at the root of the C: drive, but only accessible via the Windows Recovery Environment or certain programs like Faststone Image Viewer. This might not be directly related to the problem. To disable Fast startup, open Control Panel, select Power Options, choose what power buttons do, and turn off "Turn on fast startup" (recommended). Below are several ways to completely shut down a computer with this setting active. Often you’ll notice the lights dim quickly after the screen turns off, unlike the hibernation phase which keeps the lights on longer. Keep Shift pressed while clicking Shutdown in the Start menu or security settings (CTRL+ALT+DEL). Run the command "shutdown /s /t 0" in Command Prompt (use "shutdown /hybrid /t 0" for a fast shutdown). On some systems—such as Dell or HP—simply restart the machine and press the power button once before the loading animation starts; it will shut down almost instantly. The final method is useful if you accidentally turned on the computer or intended to shut it down but pressed "Restart" instead.
Thanks for the notice. I checked, and by default that is enabled. And based on the name "fast startup" one would be lead to believe it is a good setting. So does this setting only matter when shutting off with power button, or also when shutting off with the normal start menu "power off" GUI button? And did you notice a difference and on what type of drive? I wonder if it matters on a modern Samsung Pro or similar. But the hibernation would add some wear to the SSD. The help link only gave some copilot results not really explaining the HDD/SSD difference for this I toggled it off. But every time I shutdown, the time is a bit different anyway. And I,m sorry, what do you exactly mean by moving data to the drive when the PC was shutdown. Edit: and I don't understand how it would speed up booting anyway if all data comes from the drive regardless. A clean startup should even require less to be loaded. And leave it to MS to require SSD for W11, but then enable a setting that is meant for HDD.
I'm not saying it's a bad setting (should've clarified that), it can great for slower computers (with hard disk drives for example) but it can make some computers less reliable since if that's all someone does, Windows never truly restarts everything. It can also make SSDs start slower since it adds another step to those already fast drives. It's all the same. If you have the power button set to "Shut down" (which is the default on desktop computers), it will shut down according to the fast startup setting. I have only tested on SATA SSDs and HDDs. A lot of the links in older interfaces such as Control Panel no longer give detailed explanations like in older versions of Windows, but instead perform a web search. The differences were based in my own experience and I will clarify that in the post. It won't be same every time, but the main difference should be that the lights go off quicker. I don't care, ask away. What I meant was if you ever have to take the internal drive out of a computer to move files or folders to it (by connecting it to another computer), make sure it's properly shut down. When you put a computer into the hibernate state, it saves the contents of the RAM to a "hibernation file" on the internal drive for fast retrieval later. When you turn it back on, it puts the contents back into the RAM. Since fast startup hibernates the computer, it wouldn't have to process the startup of background processes since they're already processed and loaded in that file.
Thanks for the explanation. On a modern setup the time gap probably isn’t an issue. After powering down, I prefer beginning fresh without leftover data from previous sessions. No OS problems here, but a clean start is always wise. The idea of hibernation lets you keep the old session running. However, this mixed method feels unnecessary. I had to verify—it seems W11 doesn’t need an SSD, though they’ve phased out older systems. Anyone with insight at MS should expect SSD usage now.
Always disable fast startup right away after installing Windows... It’s the worst choice or go completely without it—no workarounds needed!* The twist *Just switch off hibernation lol; you're right, the computer starts up a bit quicker when fast startup is turned off, at least on my machine.*
I usually avoid copying files onto systems that aren’t running properly. I haven’t faced this issue before. The clear answer seems to be that you shouldn’t copy files to a drive on a system that’s off, idle, or hibernating unless you turn on “Wake on LAN” in the BIOS. Have you verified the BIOS setting? If it isn’t enabled, what were your expectations? It probably points more toward user mistakes than any real Windows problems. As for the rest, adjusting power settings is something most users are familiar with.
I've had to transfer big files between users and then restore them once the Windows setup failed. These drives lack BitLocker protection. It seems quicker than using an external enclosure, but the data stays outside the main system. I've experienced data loss before because I didn't ensure the installation was completely closed before moving files back in.
Fast startup is one of the first settings I turn off during a Windows reinstall, especially on systems using SSDs. I leave hibernate enabled but activate it in the power menu—it’s really handy for laptops with removable batteries, missing batteries, or when you just want to keep working without shutting everything down.