Amazon Basics microSDXC Memory Card Review
The Amazon Basics microSDXC Memory Card with Full Size Adapter is designed for users who need extra storage for smartphones, tablets, cameras, gaming devices and other compatible electronics. The specific product in this review is the 256GB model, ASIN B08TJZDJ4D, which is listed with A2 and U3 classifications and an advertised read speed of up to 100 MB/s. View the Amazon Basics microSDXC Memory Card on Amazon
It also comes with a full-size SD adapter, which means the small microSD card can be used with compatible devices that accept standard SD cards.
At first glance, the specifications look competitive for an everyday memory card. But numbers such as 100 MB/s, A2 and U3 can easily be misunderstood. So, this review looks beyond the marketing claims and examines the Amazon Basics microSDXC Memory Card specifications, capacity, safety considerations, customer feedback, compatibility and whether the product is actually worth the hype.
Amazon Basics microSDXC Memory Card specifications
The 256GB version reviewed here carries the model number LSMICRO256GU3. Available product information identifies it as a microSDXC card with Class 10, UHS-I, U3 and A2 specifications, together with a stated read speed of up to 100 MB/s. Check the SD card product specifications
The main specifications include
- Brand Amazon Basics
- Product type microSDXC memory card
- Capacity 256GB
- Model LSMICRO256GU3
- ASIN B08TJZDJ4D
- Speed class Class 10
- UHS speed class U3
- Application performance class A2
- Interface UHS-I
- Advertised read speed Up to 100 MB/s
- Included accessory Full-size SD adapter
- Colour Black
One thing buyers should understand is that up to 100 MB/s does not mean the card will always transfer files at 100 MB/s.
The SD Association explains that actual transfer speeds can vary depending on the card, host device, interface and operating conditions. Its speed-class system exists partly to communicate minimum sustained performance under defined testing conditions. Read the SD Association’s official Speed Class guide
Amazon Basics microSDXC Memory Card A2 rating
The A2 rating is one of the more interesting features of this Amazon Basics microSDXC Memory Card.
A2 stands for Application Performance Class 2. It is intended to identify cards capable of higher random and sequential performance for applications and application data.
According to the SD Association’s Application Performance Class standard, A2 cards are specified for minimum random read performance of 4,000 IOPS, random write performance of 2,000 IOPS and sustained sequential performance of 10 MB/s under defined testing conditions. See the SD Association’s A2 specification
That sounds impressive, but there is an important limitation.
The SD Association states that the full A2 performance is available only when an A2 card is paired with an A2-supported host device. Therefore, simply purchasing an A2 card does not automatically make an older smartphone or tablet significantly faster. Read how A2 performance works on supported devices
This is an important distinction that is often missing from simplified product reviews.
Amazon Basics microSDXC Memory Card U3 speed rating
The U3 marking refers to the card’s UHS Speed Class.
The SD Association explains that U3 is one of the UHS Speed Class ratings and is associated with minimum sequential writing performance under the standard’s defined conditions. It is particularly relevant for applications that require a sustained writing speed, including video recording. Read the official SD Association Speed Class explanation
The SD Association’s consumer FAQ also identifies U3 and V30 as commonly used for Full HD to 4K video recording. Check the SD Association consumer FAQ on video recording speeds
However, buyers should not interpret U3 as a universal guarantee for every 4K camera.
Different cameras, drones and action cameras can have different card requirements. Always check the device manufacturer’s manual before purchasing a memory card for high-bitrate recording.
Amazon Basics microSDXC Memory Card capacity
The product family is available in several capacities, while the specific Amazon listing supplied for this review is the 256GB version.
A 256GB card provides considerably more room than a basic 32GB or 64GB card and can be useful for large photo collections, video files, games and other data.
The important point is that the amount of storage printed on the packaging does not necessarily equal the amount displayed by the operating system.
This happens because manufacturers and operating systems can use different methods for calculating storage capacity. The usable space will therefore normally appear somewhat lower than the advertised capacity.
Before buying, it is also important to confirm that your device supports the capacity you intend to purchase.
The SD Association’s SD, SDHC, SDXC and SDUC guide explains how these storage classifications differ and how capacity relates to the SD standard. Learn about SDXC storage capacities from the SD Association
Amazon Basics microSDXC Memory Card safety and durability
With memory cards, safety is mainly about protecting data and avoiding premature failure rather than the type of personal safety concerns associated with food, supplements or household chemicals.
Product information for this Amazon Basics card describes features such as resistance to shock, water and extreme temperatures, as well as protection against X-rays and magnetic fields. These are manufacturer or product-level claims, so they should not be interpreted as proof that the card is indestructible.
The card should still be handled carefully.
Do not remove it while data is actively being written. Avoid exposing it unnecessarily to extreme environmental conditions, and keep another copy of important files.
A memory card is not a backup strategy.
If the card contains irreplaceable photographs, research files, business documents or important video footage, keep a second copy on another storage device or a trusted backup service.
Amazon Basics microSDXC Memory Card customer reviews
Customer feedback is one of the most interesting parts of this product.
The Amazon listing has accumulated a very large number of customer ratings, indicating that this is not a memory card with only a few isolated reviews.
Independent product aggregators also list thousands of customer ratings for the same ASIN and generally show a strong overall customer response. See additional product information for ASIN B08TJZDJ4D
Positive customer comments commonly focus on storage capacity, ease of installation, everyday performance and compatibility with different devices.
Some customers have also reported using the card for cameras, smartphones, tablets, gaming devices and dash cams.
However, negative experiences should not be ignored simply because the overall rating is high.
Some buyers have reported compatibility or individual-card problems. This is one reason I would recommend testing a new memory card before trusting it with important data.
A strong aggregate rating tells you something about overall customer experience, but it does not guarantee that every individual unit will perform identically.
Amazon Basics microSDXC Memory Card performance claims
The headline performance claim is the up to 100 MB/s read speed.
That number looks impressive on a product page, but it needs context.
The phrase “up to” means it represents a maximum advertised performance figure under specified conditions. Your actual result can be lower depending on the computer, smartphone, camera, card reader, interface and type of files being transferred.
The SD Association notes that actual memory-card transfer speeds can vary and explains why sustained speed is particularly important for video recording. Read the SD Association’s explanation of memory-card speed classes
This means the Amazon Basics card should not be judged solely by whether a personal computer produces exactly 100 MB/s during a speed test.
Large sequential files, thousands of small files and application data can produce very different results.
Amazon Basics microSDXC Memory Card for smartphones
For compatible smartphones and tablets, this card can provide useful additional storage.
The A2 rating is particularly relevant to devices that support application storage on compatible microSD cards. The SD Association explains that Application Performance Class was developed to address the performance requirements associated with applications and application data. Read the SD Association guide to A2 application performance
However, not every smartphone supports expandable microSD storage.
Some modern phones do not have a microSD slot at all, while others have restrictions on how external storage can be used.
So, check your specific phone model before buying.
Amazon Basics microSDXC Memory Card for cameras
The U3 classification makes the card potentially useful for compatible cameras and recording devices that require U3-class storage.
The SD Association explains that U3 is designed around a minimum sequential writing requirement under defined conditions and is commonly used in applications requiring sustained recording performance. Check the official UHS Speed Class standards
For 4K recording, however, the camera manufacturer’s requirements should take priority.
A card being advertised as fast does not mean it is automatically appropriate for every professional camera or high-bitrate recording mode.
Amazon Basics microSDXC Memory Card for dash cams
Dash cams deserve a little extra caution.
A dash cam can write footage continuously for several hours every day, which creates a different workload from occasionally transferring photographs.
Customer reports indicate that some users have successfully used Amazon Basics microSD cards in dash cams and security cameras.
Still, buyers who depend on continuous recording should look specifically at their camera’s recommended endurance specifications.
A card designed specifically for high-endurance recording may be more appropriate for continuous surveillance than a general-purpose storage card.
Amazon Basics microSDXC Memory Card full-size adapter
The included full-size SD adapter is a practical addition.
The microSD card can be removed from a compatible phone, camera or other device and inserted into the adapter for use with compatible standard SD card slots.
This can be particularly useful when transferring files to a laptop or desktop computer equipped with an SD card reader.
It also means there is no need to purchase a separate adapter simply to use the microSD card in a standard SD slot.
Amazon Basics microSDXC Memory Card pros and cons
Amazon Basics microSDXC Memory Card pros
- A2 application performance classification
- U3 speed classification
- Advertised read speeds of up to 100 MB/s
- 256GB capacity for the reviewed model
- Full-size SD adapter included
- Suitable for many compatible consumer devices
- Useful for photographs, videos, applications and other files
- Large volume of customer feedback
Amazon Basics microSDXC Memory Card cons
- Actual performance can differ from advertised maximum speed
- Device compatibility varies
- Full A2 performance requires compatible host support
- Not every camera supports every capacity
- U3 does not guarantee suitability for every 4K recording device
- Continuous recording users should consider endurance requirements
- Important files should not exist on the card alone
Amazon Basics microSDXC Memory Card worth the hype
There is a reasonable basis for the attention surrounding this card.
The product combines a relatively high storage capacity with A2 and U3 classifications and an advertised read speed of up to 100 MB/s. The large volume of customer feedback also provides more evidence to consider than a product with only a few reviews.
But the specifications need to be interpreted correctly.
A2 does not mean every device will deliver A2-level application performance. U3 does not mean the card is suitable for every possible 4K camera. And 100 MB/s is an advertised maximum read speed rather than a promise that every transfer will reach that number.
The Amazon Basics microSDXC Memory Card therefore makes the most sense when the buyer’s device supports its capacity and specifications and the card is being used for an appropriate workload.
For ordinary storage, compatible smartphones, tablets, cameras, gaming devices and other consumer applications, its specifications make it a practical option to consider.
For professional recording, continuous surveillance or any situation where data loss would be costly, the decision should be based on the exact device requirements and endurance needs rather than the Amazon rating alone.
Amazon Basics microSDXC Memory Card frequently asked questions
Is the Amazon Basics microSDXC Memory Card good?
The card has specifications suitable for a range of everyday storage applications, including A2 and U3 classifications. Customer feedback is also broadly positive, although individual experiences can vary.
Is the Amazon Basics microSDXC Memory Card fast?
The product is advertised with read speeds of up to 100 MB/s. Actual performance depends on the host device, card reader, interface and workload.
Is the Amazon Basics microSDXC Memory Card A2?
Yes. The listed product carries an A2 Application Performance Class rating. The SD Association explains the technical requirements of A2 cards here. SD Association A2 Application Performance Class
Is the Amazon Basics microSDXC Memory Card U3?
Yes. The card is listed with a U3 UHS Speed Class rating. The SD Association’s Speed Class documentation explains what the U3 classification means. SD Association UHS Speed Class guide
Does the Amazon Basics microSDXC Memory Card include an SD adapter?
Yes. The product is supplied with a full-size SD adapter, allowing the microSD card to be used in compatible standard SD slots.
Can the Amazon Basics microSDXC Memory Card record 4K video?
It may be suitable for devices that require U3-class storage, but the camera manufacturer’s requirements should always be checked before using it for 4K recording.
Can the Amazon Basics microSDXC Memory Card be used for gaming?
It can be used with compatible gaming devices that support microSDXC storage. Always verify the specific console’s supported capacity and card requirements before purchasing.
Can the Amazon Basics microSDXC Memory Card be used in a dash cam?
Customer reports indicate that some users use the card in dash cams. However, continuous recording places greater demands on storage media, so users who need long-term recording should check whether their dash cam recommends a high-endurance card.
Does the Amazon Basics microSDXC Memory Card really reach 100 MB/s?
The manufacturer advertises read speeds of up to 100 MB/s. Actual speeds can be lower depending on the device, interface and workload. The SD Association explains why advertised maximum speeds and sustained performance should not be treated as exactly the same thing. SD Association Speed Class standards
Is the Amazon Basics microSDXC Memory Card worth buying?
It can be a sensible option when the capacity and specifications match the device and intended workload. Buyers should compare the current price with competing cards and consider whether they need general-purpose storage or a card designed specifically for high-endurance recording.