If you own a NAS, you’ve probably noticed how noisy hard drive spinning platters can be. Common online advice often suggests turning them down when not in use to eliminate noise and save power. On paper, it makes a lot of sense, but real-world use tells a different story: for many people, keeping them spinning actually makes more sense.
Constant spin cycles cause wear and tear and can lead to premature hard drive failure.
Repeated twists are not as harmless as they seem
Mechanical hard drives are one of the few computer parts with moving parts, and like any moving part, this makes them more prone to failure. It stands to reason that a hard drive that is always spinning could experience more wear and tear and potentially lead to premature failure.
However, the spin cycle is one of the most mechanically stressful events a hard drive goes through. The internal motor has to overcome inertia to drive the platters to several thousand RPM, and the heads load and lift the platter.
This is reflected in the brief power surge, during which a hard drive can consume 10-15W (sometimes a little more on larger drives) for a few seconds while spinning. When the drive spins down, the heads park on a ramp system, and while modern drives are designed to avoid contact with the platter, improper parking or rare mechanical problems can still increase the risk over time.
General-purpose hard drives are designed to handle these acceleration and deceleration cycles, but that doesn’t change the fact that the drive’s moving parts experience additional mechanical stress during each cycle.
Now compare that to a disk that is always spinning. The plates prevent repeated starting shocks, the bearings run at a constant speed, and the motor runs in stable conditions instead of repeated acceleration and deceleration. This still causes mechanical wear, but it is slow and continuous rather than cyclical.
As a side note, NAS-specific hard drives are designed for this type of 24/7 operation and are rated to operate continuously for many years.
- Storage capacity
-
8TB
- Compatible devices
-
sata
The WD Red Plus line of hard drives is designed specifically for NAS use. This means the drive is designed to support 24/7/365 usage, with a workload rate of up to 180TB per year. You’ll also get a 3-year warranty with the purchase of WD’s Red Plus line of drives.
Another factor is thermal expansion and cooling cycles. A unit that is always spinning operates at a relatively stable temperature, while one that frequently spins up and down heats and cools repeatedly. This can introduce minor microscopic stress to components such as welded joints, bearings, and other internal materials over time.
All of this means that in some cases, aggressive braking behavior can contribute to additional wear compared to continuous operation. Don’t take my word for it: QNAP, a major NAS device manufacturer, also recommends avoiding frequent twists and turns due to additional wear.
The actual energy savings are less than most people think.
Almost nothing is saved by turning the units downwards
Let’s be honest: the main reason most people let their NAS drives stop working is not wear and tear (although it should be), but noise and power consumption. A hard drive that is in standby mode typically consumes a fraction of a watt. In contrast, a drive spinning idle with no active reads and writes can consume between 5 and 10 W, depending on the model. 2.5-inch hard drives use a fraction of this, although they probably You shouldn’t use one of those on a NAS for other reasons..
In the context of a typical home, this is still very little, roughly comparable to a single LED bulb. Even if a unit runs 24/7/365 at about 8 W, that’s about 70 kWh per year. At about $0.16 per kWh, that’s roughly $11.20 per year. Of course, that’s nothing, but the hard drive will also consume more power during actual read/write activity, so the real-world difference is even smaller.
If you have a dozen hard drives spread across multiple NAS enclosures, the combined cost of keeping everything running could start to add up to something more noticeable. But that is an edge case. Most people only have a few drives, which means that total power consumption rarely becomes a significant cost in practice.
My NAS is in constant use and I only have one hard drive
Real world use is the most important factor
I use a laptop with an external hard drive connected as a NAS media serverand is configured to operate 24/7. In the context of today’s topic, this means two things: first, I don’t really have to worry about power consumption because I only keep a single hard drive spinning, and second, really, really I don’t want that disk to fail.
I keep several copies of my work files and important photos, but the vast majority of my media only exists on this drive. Losing him wouldn’t be the end of the world, but it definitely wouldn’t be a pleasant experience either.
Since I prioritize minimizing the risk of hardware failure, it makes more sense to spend a few extra dollars a year keeping the unit running than to constantly let it go into standby mode.
My wife and I constantly access the NAS to stream media, access and backup work files, and sync photos automatically via Immich. In practice, that means the unit would probably spin up and down dozens of times a day, which defeats the purpose of an aggressive speed setting in the first place.
Plus, if the drive fails, replacing it isn’t exactly cheap given current storage prices.
Aside from longevity, another major benefit of keeping the unit running is instant access. Instead of waiting 5-10 seconds for the drive to spin up before files start loading, all of my media and work files remain immediately accessible.
If you want to put your hard drives to sleep, you need to pair them with an SSD
SSDs make spin-down setups viable
If you have multiple hard drives in your NAS and care more about reducing power consumption than minimizing mechanical wear and tear, or if you simply don’t access your files as often, letting the drives stop spinning may make sense. But for active home servers that are in constant use, aggressive shutdown configurations create more problems than they solve.
If you want the best of both worlds, you can pair the hard drives with a SSDwhich you can then use for files and apps you access frequently. Just don’t overdo it.
