In recent years the microSD cards have gone from being a simple accessory to becoming a key element to get the most out of mobile phones, action camerasDrones, tablets, and even virtual reality glasses. We're recording more and more video, at higher resolutions and bitrates, and that has led to the question of what is the faster microSD card It takes on more importance than ever.
Furthermore, while mobile phone manufacturers are reducing internal space or even eliminating the expansion slot, those who still opt for it need to take advantage of the Latest generations of microSD, with speeds far superior to those of just a few years agoAnd this is where the new MicroSD Express standard, the high-performance Extreme-type cards, and all the alphabet soup of classes, UHS, V30, U1, etc., come into play, which is important to understand in order not to make a mistake.
Who rules the world of microSD cards?
To begin, it is important to understand that there is an entity that sets the rules of the game: the SD Association, the organization responsible for defining the specifications for SD and microSD cards which we use in most consumer electronics. It's not a specific manufacturer, but an industry association that publishes the standards that brands like SanDisk, Micron, and many others then follow.
Thanks to this common framework, an Android phone, a DSLR camera, or an action camera can seamlessly read cards from multiple manufacturers, provided that Everyone respects the same specifications: SD, UHS, and now also ExpressEach time a new generation of cards appears, the SD Association updates its technical documents to define capacities, physical formats, minimum guaranteed speeds, and compatibilities.
This regulatory work is crucial because Without firm standardization, ensuring compatibility would be chaotic. between devices and memory. So, when you see logos like SDHC, SDXC, SDUC, UHS-I, U1, V30 or similar, you're actually seeing how those SD Association standards are implemented in commercial products.
In that context, the organization announced some time ago one of the most ambitious leaps in this format: The arrival of MicroSD Express, an evolution designed to bring microSD cards to SSD speedsopening the door to a much more intensive use of these tiny storage devices.
MicroSD Express: the giant leap towards SSD speeds
The SD Association presented the new format MicroSD Express at Mobile World Congress 2019 (MWC19), a trade show where many of the technologies that will later appear in smartphones and mobile devices are traditionally announced. It wasn't a product launch, but rather the official publication of a new technical specification.
The important thing about MicroSD Express is that It adopts the same interfaces used in the modern SSDsPCI Express (PCIe) and NVMeIn other words, it leaves behind the traditional approach to memory cards and relies on the same technological foundations found in the fastest solid-state drives on the market for computers and laptops.
By incorporating PCIe and NVMe, these cards can achieve theoretical transfer speeds of up to 985 MB/s as defined in the specification. We're talking about a huge leap compared to current high-performance microSD cards, which typically operate at tens of MB/s, not nearly a thousand.
To get an idea of ​​the gap, by the time MicroSD Express was being discussed, manufacturers like SanDisk and Micron had already shown 1 TB microSD cards that had read speeds of around 160 MB/s and 100 MB/s respectively. They were considered extremely fast for recording 4K video and handling large volumes of data, but still fell far short of the theoretical ceiling set by MicroSD Express.
The new cards are defined within the SD 7.1 specification of the SD Association and introduce variants such as microSDHC Express, microSDXC Express and microSDUC ExpressThese designations combine the capacity type (HC, XC, UC) with the new Express interface, making it clear which family and storage range each model occupies within the standard.
Speed ​​and more: energy efficiency and power
Until recently, the main selling point of microSD cards was becoming increasingly easy to summarize: More gigabytes and more terabytes in the same physical spaceThe headlines were for the first 256 GB card, then the 400 GB one, then the 1 TB one… Capacity skyrocketed, but speeds grew more moderately.
With MicroSD Express and the evolution of high-performance ranges, the focus changes: now The increased speed becomes the main focusIt's not just about being able to store more material, but about making it accessible quickly enough to work with very high-resolution video, very dense bursts of photos, and applications that demand intensive data access.
However, the SD Association itself emphasizes that It's not just about being faster and offering more raw powerOne of the key aspects of this new generation is energy consumption: they have been designed with better energy efficiency in mind. energy efficiency, reducing the energy consumption of the cards compared to previous generations.
This reduction in consumption has a direct impact on daily life. In a smartphone or an action camera, Every milliamp counts when it comes to squeezing the most out of the battery.A card that moves data faster but needs less energy helps to lengthen recording sessions and the overall battery life of the device.
That combination of higher performance and lower consumption This is especially interesting in contexts where devices operate for many consecutive hours, such as video surveillance systems, cameras installed in vehicles, or autonomous virtual reality equipment that constantly draws on external memory to load content.
This reduction in consumption has a direct impact on daily life. In a smartphone or an action camera, Every milliamp counts when it comes to squeezing the most out of the battery.A card that moves data faster but needs less energy helps to lengthen recording sessions and the overall battery life of the device.
That combination of higher performance and lower consumption This is especially interesting in contexts where devices operate for many consecutive hours, such as video surveillance systems, cameras installed in vehicles, or autonomous virtual reality equipment that constantly draws on external memory to load content.
Where will MicroSD Express really be beneficial?
The advantages of MicroSD Express are not limited to the mobile segment, although that is the most visible. The SD Association itself points out that The speed and efficiency improvements will be exploited across all types of compatible equipment.both current and, above all, future.
In the realm of smartphones, tablets, and mini-computers, these cards can become the ideal partner for terminals that record 4K, 8K or slow-motion video at very high bit ratesas well as for those who play games that take up several gigabytes and require fast loading times. Likewise, mini-computers such as Orange Pi 5 Pro They also benefit from fast cards to run systems and applications from removable storage.
Another big beneficiary are the action cameras, sports cameras and devices designed to record video in extreme conditionsHere, the ability to write data smoothly and without stuttering is critical to avoid losing frames or corrupting files when the action gets intense.
In the field of the Internet of Things (IoT), where thousands of small devices constantly collect and store data, microSD Express cards offer an interesting advantage: high bandwidth and improved energy efficiency in a tiny format. Internet of Things (IoT)Advanced sensors, industrial data loggers, or demanding home automation devices can take advantage of these features.
Virtual reality and augmented reality are other fields where fast storage makes all the difference. Loading complex scenes, high-resolution textures, or immersive 360° videos requires a constant flow of data, and a slow card can ruin the experience. With a next-generation microSD card, The risk of stuttering is reduced, loading times are sped up, and the overall feeling of fluidity is improved..
When will we really be able to use these cards?
Just because the SD Association publishes a specification doesn't mean you can the next day go into a store and buy a microSD Express cardThe process is step by step: first the standard is defined, then memory manufacturers design their products and, in parallel, device manufacturers integrate the necessary support into their mobile phones, cameras and other equipment.
Following the announcement of MicroSD Express, the logical next step is active standby: Manufacturers will adopt this format in their future generations of SD and microSD cardsintegrating PCIe and NVMe controllers into commercial products as it becomes cost-effective and there is sufficient demand.
In parallel, hardware designers (brands of smartphones, cameras, tablets, etc.) will have to Update your slots, internal controllers, and firmware to be fully compatible. with the new cards. Without this compatibility, the user will not be able to take advantage of the promised speeds, even if the card meets the specification.
Only when mature Express MicroSD cards coincide in the market and devices explicitly designed to support them All the benefits described in the official documentation will be available. Until then, the cards will continue to offer backward compatibility, but will operate at the maximum speeds supported by each device.
So, in practice, the schedule depends on two factors: how quickly manufacturers release competitive MicroSD Express models and the pace at which mobile phones, cameras, and consumer gadgets integrate this support. Meanwhile, the bulk of the market will continue to revolve around the already established high-performance UHS-I and UHS-II microSD cards.
Real-world example: the high-performance Extreme microSD cards
To better understand where we are today, it's helpful to look at specific examples such as SanDisk's Extreme series of graphics cards. The company, one of the world leaders in flash storage solutions, announced models such as the Extreme microSDHC and microSDXC UHS-I aimed at those who need fast memory for smartphones, tablets and modern cameras.
According to the brand itself, these cards are presented as The ideal complement for users looking to expand their device's storage without sacrificing high speedsThis is something increasingly in demand by those who record high-quality video or make intensive use of their mobile phone for photography and multimedia content.
These high-performance microSD cards offer Maximum speeds of up to 80 MB/s read and up to 50 MB/s writeAlthough they are far from the almost 1.000 MB/s theoretical speed of MicroSD Express, at the time they made a noticeable difference compared to basic cards and were more than enough for most demanding uses in Full HD.
Higher write speeds allow Shoot in burst mode, transfer data quickly, and handle fast-action photography without bottlenecks.In practice, this translates to less waiting time when checking bursts, copying files to the computer, or moving large blocks of data between devices.
In addition to speed, capacity is also a priority. These cards are offered in versions up to 64GB and above for immediate storage expansion, especially designed for Android devicesThis makes it possible to capture and store large volumes of photos, videos, and applications without overloading the phone's internal memory.
What do the speed classes (U1, Class 10, 4K, etc.) mean?
An important part of choosing the fastest microSD card for your needs is understanding What do the different speed classes printed on the card mean?SanDisk and other manufacturers often highlight that their high-end models feature classifiers such as UHS Speed ​​Class 1 (U1) and Class 10, designed for video recording.
the name Class 10 indicates that the card guarantees at least 10 MB/s of sustained write speed.This is considered the minimum reasonable requirement for recording Full HD video smoothly. The U1 class also refers to this same performance threshold, but within the UHS-I card family.
For more demanding uses, such as 4K video or higher bitrates, higher classes (U3, V30, V60, etc.) come into play, which They guarantee constant minimum write speeds above 30 MB/s and moreThe higher the video class number (V), the more suitable the model will be for recordings with high bitrates and less risk of interruptions.
Cards like the high-end Extreme microSD are designed precisely for those types of scenarios: Take advantage of high-quality HD video, high-speed photography, and imaging capabilities of 4G mobiles and modern camerasWithout that minimum guarantee of sustained writing, there is a risk that the camera will not be able to smoothly record everything that the sensor is capable of capturing.
When a manufacturer states that a card meets Class 10, U1, or a specific video class, it is committing, within the SD Association standard, to to offer at least that performance under normal usage conditionsAbove that minimum, actual speeds may vary, but those figures serve as a reliable reference when choosing a model based on what you're going to do with it.
Theoretical speeds versus actual speeds
In all card families, from the current microSD Extreme to the future microSD Express, a distinction must be made between What the specifications or advertising say and what you actually get on a daily basisThe figures of 80 MB/s, 50 MB/s and 985 MB/s are theoretical maximums or values ​​achieved under highly controlled laboratory conditions.
Many factors influence actual use: the The device you insert it into, the type of files you move, the degree of memory fragmentation, the temperature, and even the card reader you use in your computer all play a role.That's why actual sustained speeds are usually lower than the advertised top speed.
With cards that have read speeds around 80 MB/s, for example, it's quite common to see slightly lower figures when copying thousands of small files or when the card is almost full. The important thing is that remains above the minimums guaranteed by the speed class and that the host device is fast enough to take advantage of it.
In the case of MicroSD Express, something similar will happen: the figures of almost 1 GB/s mark the limit of the standard, but Not all cards or devices will achieve that speed consistently.Even so, even with lower practical values, the leap compared to previous generations will still be very significant.
Therefore, when choosing the fastest microSD card for your needs, it's advisable not to focus solely on the largest number on the sticker, but also on... the guaranteed speed classes and the compatibility of your mobile phone, camera, or device with each standardThat combination is what will ultimately define the real experience.
Compatibility and future of the microSD ecosystem
One of the best-resolved aspects of the SD and microSD ecosystem is the backwards compatibilityIn general, a new card will work in older readers and devices, although you won't be able to take full advantage of all its features. The same will apply to MicroSD Express. They will be able to operate in traditional mode on equipment that does not support their advanced interfaceworking at lower speeds but maintaining basic functionality.
This is key so that users don't have to tread carefully every time they upgrade their SIM card. Even so, to enjoy the highest speeds, the device will need to clearly indicate that it supports the new specifications, either through official logos or the manufacturer's technical data sheets.
Looking ahead, everything points to Card manufacturers will continue to move up the ladder in both capacity and speedTaking advantage of improvements in flash memory manufacturing processes and increasingly sophisticated controllers, MicroSD Express will establish itself as the foundation for scenarios where previously only internal SSDs were used.
For their part, mobile phones, tablets, cameras and IoT devices will have to decide what balance is best for them between cost, complexity and performanceNot all devices will need a slot capable of delivering almost 1 GB/s, but in the most demanding segments (professional video recording, advanced virtual reality, etc.) it is likely to become a major selling point.
Ultimately, for the average user, the key will be in Knowing how to read specifications, distinguish speed classes, and verify the actual support for your device Before investing in the fastest card on the market, this information will make it much easier to choose the right microSD card for each situation without overpaying or falling short on performance.
This whole picture, with the SD Association setting the course, MicroSD Express promising speeds close to those of an SSD, current cards like SanDisk's Extreme offering up to 80 MB/s read and 50 MB/s write, and a progressive improvement in power consumption and reliability, paints a scenario in which microSD cards will remain an essential element for expanding and accelerating storage for quite some time. in mobile phones, cameras, connected devices and countless other gadgets, as long as we know what to buy and how to get the most out of it.
