There are hard drive options aimed at a variety of different use cases. One drive might be designed for use in a NAS (network-attached storage), while another is for people who need a drive to be as quiet as possible. But if you look a little further, beyond the gamer-oriented LEDs and OLED monitors, you’ll find something else. Look closely, and you’ll see a whole different beast: the enterprise hard drive.
Two drives might look similar, both with the same 3.5-inch form factor and SATA III interface. But that’s just part of the story, because how a hard drive is built, and which components it uses, is a bigger deal than you might think.
Built for the hustle and bustle of the server room
Enterprise drives have it tough
Most hard drives will fail eventually. They could overheat, suffer from read and write fatigue, and simply give up the ghost. But the true enemy of the hard drive is vibration. Jostle a spinning hard drive too much, and it won’t be long before you’re heading to the store for a new one.
Consumer drives, like the ones found in your PC, have it easy. The only vibration that they deal with is the hum of a cooling fan or two. But the same can’t be said for hard drives used in data centers. And that’s why enterprise hard drives are built to a whole different standard.
Enterprise drives are designed to be packed into dense server racks, usually with countless more drives beside them. Each drive vibrates as it spins, and when you add the industrial cooling solutions that keep server racks from overheating, the cumulative rotational vibration (RV) quickly adds up.
Consumer-grade drives wouldn’t stand a chance in this kind of environment. Those micro-vibrations would eventually cause the drive’s read/write heads to become misaligned. At best, their performance would suffer. At worst? Mechanical failure. Enterprise-grade hard drives feature physical RV sensors that detect vibrations and then allow the drive to compensate, maintaining alignment of their platters’ data tracks. These drives also feature a reinforced chassis, designed to absorb kinetic energy before it can do any damage. Consumer drives have neither feature.
Rating the workload of an enterprise drive
It’s a tough job, but someone’s got to do it
It’s clear that hard drives destined for use in data centers are in for a world of hurt. It’s also important to remember that these drives are built to only ever power down if and when they fail. If everything works as it should, they’ll keep spinning until the day they are replaced. And they’ll read and write a ton of data in that time.
A standard desktop hard drive is rated for anywhere between 55TB and 180TB of data transfers per year. They also tend to have a Mean Time Between Failures (MTBF) rating of around one million hours. Manufacturers assume that most computers will be turned off or put to sleep overnight, and they may sit idle even when powered on. But enterprise drives don’t have that luxury.
Enterprise drives are instead rated for 24/7/365 operation under a constant workload, reading and writing data every second of every day. When in operation, drives found in data centers can expect to read and write around 550TB each year. For this reason, enterprise drives have more than double the standard MTBF, around 2.5 million hours; they’d need to be replaced too regularly otherwise.
- Brand
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Western Digital
- Capacity
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10TB
- Power
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SATA
- Speed
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198.2MB/s (Read), 181.6MB/s (Write)
The paradox of equal pricing
These things should cost more, right?
Now that we know what makes an enterprise drive so different from one built for consumers, it stands to reason that it would also cost more. But we know that isn’t always the case. Take Seagate as an example. Its 8TB IronWolf NAS drive normally sells for between $180 and $200. Seagate’s Exos 8TB enterprise drive frequently sells between $165 and $195 despite having a longer warranty and 3x the annual workload rating. And the reason is a simple matter of economics.
Most people use a single hard drive. It’s probably a USB-C affair that stores backups or large photo libraries. And you probably don’t buy one very often. But data centers are a different story. They buy hard drives by the exabyte, building data centers for cloud storage and online backup solutions that don’t need super-fast SSDs. And because the companies that build data centers need so many of these drives, it’s more cost-effective for hard drive manufacturers to produce enterprise drives than it is to produce consumer models.
It’s an economy of scale thing, but it doesn’t mean you should just buy an enterprise drive and benefit from everything it has to offer — including a longer lifespan. Manufacturers differentiate their enterprise and consumer drives in other ways, such as the noise or heat that they generate. These things don’t matter in an enterprise environment, but they very much do when your PC is in the same room, and you’re trying to get some work done.
The right drive for the right job
Drives that are built to last
All of this boils down to one thing. It’s important to choose the right hard drive for the job. If you’re looking to store data at home, whether inside a PC case or on your desk, you’re going to want to go the consumer route. If only to save your ears. You might be tempted to buy the enterprise drive, but the drawbacks mean that you really shouldn’t.
But in the enterprise world, it’s all about that longevity. Nobody cares if a web server’s hard drive makes a racket. They just want to know that it won’t need to be replaced every other week.