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Internal Computer Storage Types – Pros and Cons

By ·Categories: Tech Explained·Published On: April 27th, 2022·4.9 min read·

The number of internal computer storage types has grown significantly over the years. It wasn’t that long ago when the only storage decision you had to make was how much capacity you needed. The amount of data you can put on your storage medium of choice is still an important factor, but it’s far from the only one.

Internal Computer Storage Types

Below we’ve broken down the most common internal computer storage types and listed a few pros and cons for each. The right choice for your project will include a combination of factors, but this high level overview should help.


HDD stands for hard disk drive, which are sometimes still called “platter” drives. They consist of spinning disks, coated with a thin magnetic film, onto which data is written and read from. Most personal computers used HDDs until the 2000s, when solid state drives, or SSDs, began growing in popularity.

A graphic of a hard disk drive

  • Pros
    • Lower cost per GB than SSDs
    • Available in high capacities
  • Cons
    • Physically larger than SSDs
    • Moving parts vulnerable to damage
    • Require cabling for data and power
    • Require more power than SSDs
    • Poor random access latency


When compared with the other solid state options, Serial-ATA, or SATA SSDs most closely resemble their hard disk counterparts. SATA SSDs, also sometimes called 2.5-inch SSDs, provide three to four times the read/write speeds of HDDs and use the same interface. Check out our full blog post and video comparing HDDs and SSDs.

Line drawing of a SATA SSD

  • Pros
    • Faster than HDDs
  • Cons
    • Slower than other SSDs
    • Require cabling for data and power

It’s important to note that 2.5″ drives, both HDD and SSD, are available in differing heights. This can be especially important if you’re planning to use them in hot swap bays. Check out our blog about hot swap bays and hard drive height to learn more.


Mini-SATA, or mSATA SSDs are smaller than their standard SATA SSD counterparts. With no external enclosure, mSATA SSDs fit more easily into compact devices and offer similar performance and specifications to SATA SSDs, but typically have lower storage capacity. mSATA drives share a form factor and connector with Mini-PCIe cards.

Line drawing of an mSATA SSD

  • Pros
    • Faster than HDDs
    • Smaller than SATA SSDs
    • No cables required
  • Cons
    • Typically lower capacity than SATA SSDs
    • Slower than other SSDs
    • Capacity limited to 1TB

eMMC Storage

Memory cards, also called Multi Media Card (MMC) storage, are found in a wide range of electronics. They were the precursor to Secure Digital (SD) storage, which is most commonly found in digital cameras and cell phones. Embedded MMC (eMMC) directly affixes the MMC storage to the system’s motherboard. eMMC is a popular storage option for mobile and other compact devices that prioritize space savings and value.

A line drawing of eMMC storage

  • Pros
    • Smallest of the commonly available storage options
    • Low cost
    • No cables required
  • Cons
    • Low capacity
    • Slower than other SSDs
    • Not replaceable or upgradeable
    • Not reliable in environments with unstable power

M.2 SSDs

M.2 SSDs look very different from SATA SSDs and more closely resemble sticks of RAM than traditional hard drives. Initially designed for high-speed storage in space-constrained devices like laptops, M.2 SSDs are available in two distinct versions based on how they interface with the computer’s motherboard. We’ve previously covered much more about the M.2 form factor.

A line drawing of an M.2 SSD


  • Pros
    • Faster than HDDs
    • Smaller than HDDs and SATA SSDs
    • No cables required
  • Cons
    • No NVMe support (see paragraph below for more info)
    • Lower data read and write speeds than PCIe M.2 SSDs
    • Higher cost


  • Pros
    • Fastest data read and write speed
    • Smaller size when compared to HDDs
    • Supports NVMe (see paragraph below for more info)
    • No cables required
  • Cons
    • Higher cost
    • Higher power consumption (still lower than HDDs)

What is NVMe?

Until fairly recently, communications protocols for storage drives hadn’t changed much since the days of HDDs. In 2011, Non-Volatile Memory Express (NVMe) was released with the goal to increase the performance capabilities of SSDs. NVMe storage drives communicate via the higher speed PCIe bus, rather than the SATA connections that most of their predecessors use. 

Storage drives that use the NVMe protocol start the read and write tasks faster, transfer more data, and finish operations more quickly. According the NVM Express group, who introduced the standard, “current PCIe 3.0 x4 NVMe SSDs are 6-7x faster than a SATA SSD, and PCIe 4.0 SSDs are 12-13x faster than a SATA SSD”.

Which of the internal computer storage types should you choose?

Ultimately, your choice of internal storage drive will depend on what you need your system to do. In tandem with the pros and cons above, you’ll want to consider:

  • How much storage capacity you need
  • How fast you need to read and write data
  • What environmental factors your system will be exposed to
  • What form factor drives your system can support
  • Your budget for storage drives
  • Your need to replace or upgrade drives

As far as storage options in OnLogic Systems, here’s some expert advice from Sales Engineer Pete Pikulski.  

“We’ve largely moved away from recommending HDDs for use in our fanless systems. Most HDDs have an ambient temp range of 50-60°C, which isn’t suited for use inside a fanless enclosure. SSD technology has also come a long way in the past few years. Frequent re-writes had previously been a limiting factor for some applications, but modern SSDs don’t generally suffer from the same potential longevity challenges as older drives. Many of today’s drives are rated to allow for a complete rewrite every day for 3+ years without degradation.”

If you’re working on an industrial computing project and have questions about your storage options, our solutions specialists can help.

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