Dear Lifehacker, I know hard drives can fail, but how long do they really last? Will they last longer if I don't use them as often? Sincerely, Drives for Posterity
Dear Drives for Posterity,
These are good questions! You're essentially asking how long different kinds of hard drives will last under regular or normal use, and then how long they will last under no use at all (as in, stored in a box somewhere). Let's go through each of them one by one.
Under Normal Use
Any hard drive in active use is essentially a ticking bomb. Let's be honest: It's not a matter of if a hard drive fails, it's a matter of when, and how lucky you'll get postponing that as long as possible. If you're really lucky, it will be after you've upgraded to a new one. If you're unlucky, it will be in a matter of months or years, and we can only hope you've made sure to back up your computer before it happens.
As for the average life of the hard drive in your computer, well, that depends mostly on whether it's an HDD or an SSD. Here's the basic breakdown and some average life expectancy:
- Hard Drives: Traditional hard drives, which you'll usually find in desktop computers (and some cheaper laptops) will often fail sooner because they use moving parts. The average life of a hard drive depends on a lot of things, like the brand, type, size and interface method, but you're looking at about four years on average. Online backup service Backblaze studied the drives in their infrastructure and found about 80 per cent of them survived for four years. Of course, that also means 20 per cent didn't and failed sooner, most of those in the third year of use. Similarly, the brand of drive you use makes a difference. Seagate, for example, failed much more frequently than Western Digital or Hitachi drives in Backblaze's tests. You can check out the raw data on all 41,000 drives for more. In short, keep your data backed up, watch for SMART alerts, and keep an eye on your hard drive's warranty. Most are about two to three years, and while your drive may last much longer than that, be ready for failures after that point.
- Solid State Drives: Solid state drives, which have become extremely popular in laptops and desktops for their faster speeds, are different. You may hear people say that you have to be careful with SSDs because they have a limited number of reads and writes. In reality, consumer SSDs actually last a really, really long time under normal use. TechReport's famous SSD endurance test showed us that a lot of those fears are over-blown, and even consumer SSDs managed to survive writing and reading well over 700TB of data. These drives usually come with a three to five year warranty, and manufacturers assume you'll write 20GB-40GB per day in data. That means to get to that 700TB, you'd have to do 40GB every day for 17,500 days, or just shy of 50 years. That doesn't mean you should mistreat your drive, and it doesn't mean SSDs won't fail due to other issues, but if you're worrying your SSD will die because you used it too much, don't.
Of course, all of this is average data. Your experiences may differ, and you may wind up with a great drive that lasts forever, or another one that fails a few days out of the box. That's why it's important to keep your systems backed up. Beyond that though, stick to trusted brands with solid warranties that don't make it a nightmare to RMA a drive that dies before its prime.
If You Aren't Using Your Hard Drive at All
The other side of the coin involves "cold storage". If you write data to a drive and then, let's say, drop it in a safe deposit box or a time capsule, how long would the data on it survive before it degrades? Well, we touched on the question a bit in this guide to storing data for the long haul, but if you're talking about true cold storage -- as in you don't want to access it for years, perhaps decades at a time, the numbers change a bit.
Again, things are different depending on whether you're talking about SSDs or traditional HDDs. Here's what you need to know:
- Hard Drives: If you're planning to drop some data on a hard drive and toss it into a storage unit or a safe deposit box, you probably don't need to worry about the data deteriorating on its own. On episode 11 of TekThing, Patrick Norton talked to PCPer's Allyn Malventano, who said as long as your drive is in a climate controlled environment, the only issue to worry about is the oil around the ball bearings drying out. In short, spin them up every few years -- which you should do anyway to make additional backups and switch storage methods (which we'll get to a little later.) If your environment isn't climate controlled, well -- just make sure it's climate controlled. A time capsule in the ground with a hard drive in it likely won't survive to be dug up and read.
- Solid State Drives: SSDs for archival purposes is a difficult thing to pin down. SSDs are still relatively new technology, especially compared to magnetic media (which most businesses still use for archival backups) so there aren't many serious studies as to their long-term survivability in cold storage. We have an idea that, under power, SSDs can last a good long time, but even SSD technology is evolving (future consumer SSDs will likely be PCI, just for speed purposes, the way enterprise SSDs have been for a while) and everything could change again in a matter of years. Theoretically though, assuming a climate controlled environment the only thing you'd have to worry about is the slow degradation of data in the drive's NAND cells, but that's a process that takes decades, possibly longer.
Long story short, if you keep a hard drive offline and in a box -- as long as it's someplace well maintained, you'll have other problems to worry about long before the eventual degradation of the data on the drive. Conceivably, you could keep either for decades, probably longer, and then fire them up and they will work as good as they did the last time they were powered down, and the data would be right there for you to read.
The More Important Factor: Interface Technology
All this talk about the mechanical or physical life of storage is great, but it misses the biggest, most important point: The pace of technology, and how quickly your drive's connection interface or platform will be obsolete. After all, it wasn't too long ago that the hard drive interface standard was IDE, then SATA, then SATA II and III. For external media, long before we had USB 3 and Thunderbolt, we made do with Parallel Port and Serial connections. While the drives buried inside those old Parallel Port or IDE-based storage devices probably still function, and still have their precious data on them, you need to find equally old technology (or working converters and adapters) to retrieve it.
This is a bigger issue, one that data archivists struggle with, and a more pressing matter for anyone thinking about saving data for posterity -- or trying to hand down electronic information to future generations. If you think you can slap some precious photos onto a 1TB USB drive, put it in a safe deposit box at the bank, and will it to your children with instructions to open it when you pass away, it's a gamble that (depending on how old you are, of course) there will be any USB devices left by the time they get around to seeing what's on it. Just think: If someone handed you a ZIP disk today and told you there was something important on it for you, how would you go about getting at that data? What about a 5.25-inch floppy? Your best bet is to, instead of setting and forgetting it, to diversify your storage methods, update data and drive formats every few years, and keep more than one type of backup whenever possible.
In any event, the physical life of your hard drive is one thing, but the practical, useful life of it is something completely different. Hopefully we've addressed both for you here though, and you can rest assured knowing your drives will probably last you a while. That said, make sure you back up your data!
Got your own question you want to put to Lifehacker? Send it using our contact form.