There are a lot of misconceptions around the topic of PC storage, and external HDDs aren’t immune to those. It might seem that they can just about live forever, but that’s not entirely the case.

Just like an SSD can fail at 100% health, an external hard drive can fail, too, and you might even say that yours has an expiration date. It’s just a matter of figuring out when it is for your particular drive, and preparing an exit plan so you’re ready in case that ever happens.

External drives rarely die on schedule

Age is just a number (kind of)

External drives don’t exactly just reach a specific birthday and then decide that’s it, they’re done. One drive might run for years without complaint, while another starts throwing errors much sooner, especially if it’s been dropped, kept plugged in constantly, carried around in a bag (with next to no protection), or used as the only place where important files live.

That’s what makes their so-called expiration date tricky to determine. It’s not going to be printed on the drive, after all, so best thing you can do is guesstimate.

Still, age matters because it gives you context for every other warning sign. A newer drive with clean health data and no strange behavior is one thing; an older external HDD that’s out of warranty, running slowly, clicking, disconnecting, or showing bad sectors is something else entirely.

The point is that we’re not going to try to determine the exact date and time of death. We’re just trying to spot the point where the drive is no longer dependable.

Start by checking your drive’s age and warranty status

The serial number tells a story

Credit: Dibakar Ghosh | How-To Geek / Google Gemini (Nano Banana Pro)

So, if you’re hunting for that expiration date, the easiest place to start is with the drive’s age, because that gives you an immediate baseline for how much trust it deserves.

If you know when you bought it, awesome. If not, check the model and serial number on the drive itself, in the manufacturer’s software, or through a warranty lookup page. Warranty status won’t tell you whether the drive is healthy, but it does tell you something useful. If the manufacturer no longer considers it worth covering, you probably shouldn’t trust it with your most important files.

This is also where power-on hours come in, assuming your external drive exposes that data properly. An external HDD that spent five years in a drawer is not the same as one that spent five years permanently plugged into a NAS or a PC. I use CrystalDiskInfo to check this.

Calendar age matters, too, but actual usage is more important. Write down what you can to know everything you need about the drive at a glance: purchase date, warranty status, power-on hours, and what the drive is currently storing. That alone can make it easier to decide what happens to the drive when the time comes.

SMART data is the closest thing to a warning light

Watch the trends

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SMART data is one of the best ways to check whether a drive is starting to struggle, but it still won’t give you a neat countdown timer. Tools like CrystalDiskInfo can show you the drive’s health status, power-on hours, and temperatures, plus a bunch of useful statistics. It’s always worth checking.

For external HDDs, the big ones to pay attention to are things like reallocated sectors, pending sectors, uncorrectable errors, and command timeouts.

The important part isn’t just to focus on whether one number looks bad right now. It’s more about the trends. A drive with a few old reallocated sectors might keep working for a while, but a drive that’s steadily adding new bad sectors is telling you something’s off. If SMART warnings start stacking up alongside age and poor performance, it’s time to cut the cord.

Listen for mechanical clues and watch for bad behavior

The drive will usually complain first

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SMART data is useful, but sometimes, an external HDD makes the problem much more obvious. The “click of death” may have mostly applied to the Iomega Zip drive, but HDDs make clicking sounds, too, and you don’t want to hear them too often.

Clicking, grinding, repeated spin-up attempts, beeping, sudden disconnects, failed file transfers, and huge speed drops (on top of already slow HDD speeds) are all signs that something is wrong even if the drive appears to be working.

Run diagnostics, but do it in the right order

Backup first, test second

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If your external HDD is already acting suspicious, do not start with the most brutal scan you can find. Start by copying the most important files somewhere else, as that’s what matters the most. Once you whisk them off somewhere safe, you can keep trying to diagnose what’s going on with the drive.

Run a short SMART test, a manufacturer diagnostic tool, or a Windows check (if that’s your OS of choice) to see what you’re dealing with. Just remember that passing a test doesn’t mean that your drive is 100% trustworthy. The older and more battered it gets, the less reliable it’ll be.

Know when to let go

At some point, the best thing you can do with an old external HDD is just demote it. I don’t mean throwing it away. Turn it into a drive for less important stuff; I call mine an “abuse drive.” If the drive is in charge of less important files, it can keep on keepin’ on until it finally kicks the bucket.