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Form Factors

Storage device form factors define the standardized sizes and shapes that allow drives and memory modules to physically fit and function within compatible hardware. This covers the major form factors used in modern IT environments, from 3.5-inch and 2.5-inch drives to mSATA, M.2, and RAM module formats.

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About this video

Form factor is the standardized size and shape specification that determines whether a storage device or memory module will physically fit inside a given system. Because drives and memory are almost always manufactured by different companies than the machines they power, adherence to these standards is essential for cross-vendor compatibility. A component that is even slightly too large will not seat properly, while one that is too small may shift or rattle within its bay, potentially causing damage or unreliable connections. These standards exist to ensure that hardware from any compliant manufacturer can be installed reliably across a wide range of systems. Drive form factors have shrunk considerably over time while storage capacities have increased. The 3.5-inch form factor was once the dominant standard, commonly found in desktop systems. It was gradually succeeded by the 2.5-inch form factor, which became the standard for laptops and is widely used in SSDs. More compact formats followed, including mSATA and the M.2 form factor, which is now common in modern thin-and-light systems. Each generation reflects the broader trend in technology toward miniaturization without sacrificing performance or capacity. Form factor considerations extend beyond long-term storage to other hardware categories as well. RAM modules, for example, follow their own form factor standards, with SO-DIMMs designed for laptops and full-size DIMMs used in desktops. Selecting the correct form factor is a fundamental step in any hardware procurement or upgrade process, and compatibility must be confirmed before purchasing components for any specific system or device.

What you'll learn

What's covered

Storage Device Form Factors

Aligned to

CompTIA Tech+
2.5 Compare and contrast storage types.
CompTIA A+ Core 1
3.3 Given a scenario, select and install storage devices.
CompTIA Server+
1.2 Given a scenario, deploy and manage storage.

Key terms

Form Factor
The physical size, shape, and connector type of a hardware component such as a drive or motherboard; form factor determines compatibility with a given system chassis or slot.
3.5-Inch Drive
A larger storage drive form factor historically used in desktop computers, now largely replaced by smaller alternatives.
2.5-Inch Drive
A smaller storage drive form factor commonly used in laptops and as a replacement for 3.5-inch drives in desktops.
mSATA
A compact solid-state drive form factor based on the SATA interface, designed for space-constrained devices such as laptops and embedded systems; significantly smaller than the standard 2.5-inch drive while delivering the same SATA performance.
M.2
A small card-style internal drive form factor that plugs directly into a motherboard slot, supporting both SATA and NVMe interfaces to deliver high storage performance in a minimal physical footprint; standard in modern laptops and desktops.

Topics

Storage Hardware Form Factors M2 Msata Hardware Compatibility Computer Hardware

Transcript

What a Form Factor Is

Our storage devices need to fit into our computer, and so we have certain standards of what the size and shape of these different drives is. We call it a form factor.

A form factor is one of the considerations when we're purchasing a drive. What a form factor is, is the size and shape of a drive. It might not seem that important what the size and shape is, but imagine this just being a little bit too big — then it wouldn't fit in the spot that it's supposed to be in. Or perhaps it's a little bit too small, then there's too much play in this and it can rattle around inside the equipment. So it has to be just right, and there are very specific standards in the sizes and shapes of these different drives.

Why It Matters

One of the reasons why this is so important is because our storage devices are usually made by a different company than the rest of our hardware. For instance, this is a Dell laptop, and there's a spot to slide in a hard drive in here, and this hard drive needs to be able to fit in here. Of course, there's a little tray that goes into here to slide it in, but it needs to be able to slide into that spot in order to connect to this laptop.

Not only that, but a lot of our hardware can be used in other devices. For instance, here's a desktop, and being able to install this in the desktop could be critical as well.

Drive Form Factors

Of course, typical with technology, what we've seen is that our drives have shrunk in size while increasing in capacity. What we have right here is a 3 1/2 inch form factor, and this is what we used to use on a lot of our machines. Then at some point in time we started using 2 1/2 inch primarily and started replacing all of our drives with 2 1/2 inch. This is an mSATA right here, and then this right here is an M.2. So we see some different form factors here, and we see that it's shrunk over time.

What we see right here is really mainly long-term storage, these two being hard disk drives, these two being solid state drives.

Form Factors Elsewhere

But we have different form factors with other equipment as well. For instance, if you were to buy RAM or memory for your computer, then this is what those look like. Here's two different types of RAM, or two different formats for RAM: this one is more built for laptops, versus this is more for desktops. So we do have different form factors in other areas as well.

These are examples of form factors here, and there are a lot of other form factors. In fact, I don't even have the 3 1/2 in FL listed right here. So just realize that there are a lot of different form factors out there, and you'll have to buy the right form factor.

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