If you've ever held the power button to shut your PC down, you've done an "unsafe shutdown," and chances are that your SSD wasn't too happy about it. The event was probably logged, adding up to your error count.
That doesn't mean the drive was instantly damaged, of course. But it does mean that the storage didn't get a clean heads-up to wrap up what it was doing. Are unsafe shutdowns as bad as they seem? Let's break it all down.
What really is an "unsafe shutdown"?
There's more to it than one might think.
Patrick Campanale / How-To Geek
An unsafe shutdown is exactly what it says on the label: your PC, and thus your SSD or your hard drive, lost power without a clean, coordinated shutdown process. That can happen because you forced the PC off, but it can also be the result of a crash, a restart, or a dip in power, among other things.
On your end, you can cause it by holding down the power button, flipping the PSU switch if you're on desktop, or yanking the plug (again, desktop). But a hard lockup followed by an automatic restart can count too, and that can happen even if you've never touched anything.
The thing is, your storage doesn't really care how the shutdown happened (well, provided nothing else is majorly wrong). The only thing that matters in this context is that it never got the proper shutdown notification before power disappeared, and this can often interfere with reads and writes.
Why does this matter? SSDs are constantly juggling in-progress writes, cached data, and internal bookkeeping that maps your files to flash memory. If power drops at the wrong moment, a write can be left half-finished, or the drive may have to rebuild its state on the next boot.
A one-off unsafe shutdown isn't a problem. I end up doing these myself sometimes, if the PC locks up for any reason or I get a GPU driver crash (happens more often than I'd like). If your system recovers just fine, it's alright to move along.
But if the shutdown counter keeps on climbing, then we're firmly in the red flag territory.
Find the number, then match it to the crash
Before investigating, let's check the error count.
Patrick Campanale / How-To Geek
Your drive keeps information on how many unsafe shutdowns it's been through during its lifetime, but you may not find it in your OS without any extra tools. Fortunately, tools like CrystalDiskInfo, HWiNFO, Hard Disk Sentinel, or proprietary tools like Samsung Magician, can tell you the status of your SSD health . That includes error counts.
So, once you find your tool of choice and start digging into SMART health data, you'll often find this particular metric listed as "unsafe shutdowns," "unexpected power loss count," etc. The exact name depends on the tool.
In an ideal world, that number will be very low. On my main SSD, it sits at just nine during the two years I've owned it.
To figure out what's going on and whether it's affecting your SSD, start by taking a baseline. Note the current unsafe shutdown number so you can compare it later without second-guessing yourself.
Now, match the moment the number increased to what your OS thinks happened. Windows has a handy tool that's terribly underutilized by most people; it's called Event Viewer. In there, you can look up every single shutdown. Keep an eye out for Kernel-Power events and unexpected shutdown entries.
What I like to do next is look up the error code online to see what caused the shutdown, unless I already know (mostly because it was me).
This gives you a good baseline to work with.
What unsafe shutdowns suggest about power and stability
If you didn't cause it, then what did?
Ismar Hrnjicevic / How-To Geek
If all the unsafe shutdowns line up with you forcing your PC off, then that's great. It might be good to stop doing it, but otherwise, your PC seems to be working well.
But if you have error counts you can't quite account for, it's time to investigate. Your SSD is basically telling you that your PC is losing the plot somewhere upstream. It could be a power dip or a hard reset; in any case, something's off.
The pattern matters more than the number itself. As I mentioned above, driver crashes are notorious for causing these random shutdowns, and they're not the end of the world, as they themselves don't imply there's any fault with your hardware. However, seeing regular Kernel-Power events in Event Viewer around the same time as those shutdowns tells us that it might be more of a stability issue than an SSD problem.
A desktop PC that's suffering from power-adjacent issues is always one you need to treat with care. I've dealt with PCs over the years that seemingly worked fine, but would shut down at random. A common cause for them all? A faulty or not beefy enough PSU.
Outside of that, you could still be dealing with small things like a flaky power strip, a loose power cable, or an outlet that needs to be fixed. It could be anything, but the end result will often be an unsafe shutdown and an extra unsafe shutdown for your SSD.
If power looks fine, start thinking about stability. GPU driver crashes, unstable overclocks, undervolts that are too aggressive , and marginal RAM can all hard-freeze a system and force a reset.
When unsafe shutdowns actually line up with corrupted data
Do you have to worry about your files?
Patrick Campanale / How-To Geek
A single unsafe shutdown won't kill your SSD (provided there's no power surge and it's not overheating ). Even a dozen shutdowns might not matter in the grand scheme of things. But what about data corruption?
Unsafe shutdowns are really more about timing than raw drive health. An SSD can die at 100% health , and in that same vein, files can get corrupted regardless of what SMART data tells you.
As such, if the PC shuts down when nothing important is being written, your files should make it through unscathed. But the risk goes up when the PC is in the middle of writes. This includes file transfers, but also updates, game installs, working on a project, and so on. If you're actively doing something, chances are you may lose some data by virtue of it not being saved, but also some may be lost to silent corruption.
Modern file systems can often fix themselves well enough that your PC boots normally, but that doesn't guarantee that every file will be just fine. After each shutdown, go through what you were previously working on and make sure it's fine, and follow a 3-2-1 backup rule to avoid losing important files.
