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SanDisk 512GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-512G-GN6MA

4.8 4.8 out of 5 stars 350,945 ratings
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Purchase options and add-ons

Brand SanDisk
Model Name Extreme
Flash Memory Type Micro SDXC, Micro SD, Micro SDHC
Memory Storage Capacity 512 GB
Compatible Devices Camera, Smartphone

About this item

  • Up to 160MB/s read speeds to save time transferring high res images and 4K UHD videos (2); Requires compatible devices capable of reaching such speeds
  • Up to 90MB/s write speeds for fast Shooting; Requires compatible devices capable of reaching such speeds
  • 4K UHD and Full HD Ready (2) with UHS Speed Class 3 (U3) and video Speed Class 30 (V30) (5)
  • Rated A2 for faster loading and in app Performance (8). Compatible with microSDHC, microSDXC, microSDHC UHS-I, and microSDXC UHS-I supporting host devices
  • Built for and tested in harsh conditions: temperature Proof, Water Proof, shock Proof and x ray Proof(4)
  • Get the SanDisk Memory Zone app for Easy file management (available on Google Play) (3)
  • Order with Your Alexa Enabled device; Just asks 'Alexa, order SanDisk microSD'

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Price$44.68$42.70-21% $16.58
List:$20.99
-34% $11.27
List:$16.99
-9% $25.55
List:$27.99
$92.27
Delivery
Get it as soon as Thursday, Sep 19
Get it as soon as Thursday, Sep 19
Get it as soon as Thursday, Sep 19
Get it as soon as Thursday, Sep 19
Get it as soon as Thursday, Sep 19
Get it as soon as Thursday, Sep 19
Customer Ratings
Sold By
QuickWare
Amazon.com
Amazon.com
Amazon.com
QuickWare
Amazon.com
flash memory type
Micro SDXC, Micro SD, Micro SDHC
Micro SDXC
Micro SDXC
Micro SDXC
Micro SDXC
Micro SDXC
memory capacity
512 GB
512 GB
128 GB
64 GB
256 GB
1 TB
speed class
class 10
class 10
class 10
class 10
class 10
class 10
write speed
90 MB
90
80
130 MB per second
130 MB per second

From the manufacturer

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

SanDisk Extreme 128GB

MobileMate USB 3.0 Reader

MobileMate USB 3.0 Reader

128GB Card & Reader Bundle

Video Quality

Capture uninterrupted 4K UHD and Full HD video without skipping frames

Move Files Fast

10X faster than with USB 2.0 readers⁸ with the performance of USB 3.0

Capture Hi-res video Fast

Capture uninterrupted 4K UHD video anytime anywhere

Read Speed

Up to 160MB/s* means shorter wait times when transferring files

Read Speed

Up to 160MB/s⁹ so you can move big files (or a lot of files) fast

Read Speed

Up to 160MB/s⁹ so you can move files fast

Write Speed

Up to 90MB/s* enables you to capture fast action in full detail

Compact & Durable

Take it anywhere—built to hold its own when tossed in your bag

Performance Rating

Record and shoot faster with C10, U3, and V30, and load apps faster with A2

USB 3.0-Compatible

The reader is compatible with USB 3.0 and backwards-compatible with USB 2.0

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Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
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SanDisk 512GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-512G-GN6MA


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Product Description

With the SanDisk Extreme 512GB (1) microSD UHS-I Memory Card get extreme speeds for fast transfer, app performance, and 4K UHD video. (2) Ideal for your Android smartphone, action cameras or drones, this high-performance microSD card handles 4K UHD video recording, Full HD video and high-resolution photos. The super-fast SanDisk Extreme microSDXC memory card reads up to 160MB/s and writes up to 90MB/s. Plus, it’s A2-rated, so you can get fast application performance for an exceptional smartphone experience. (7) | Not all devices support microSD memory card formats. Check with your device manufacturer for more details. | For 128GB-1TB: Up to 160MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires compatible devices capable of reaching such speeds. Up to 90MB/s write speeds. 1MB=1,000,000 bytes. | (1) 1GB=1,000,000,000 bytes. Actual user storage less. | (2) Compatible device required. Full HD (1920x1080) and 4K UHD (3840 x 2160) support may vary based upon host device, file attributes and other factors. | (3) Download and installation required. | (4) Card only. See SanDisk website for additional information and limitations. | (5) UHS Speed Class 3 (U3) designates a performance option designed to support real-time video recording with UHS-enabled host devices. Video speed class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS-enabled host devices. | (6) Registration required; terms and conditions apply. | (7) For 64GB-1TB: A2 performance is 4000 read IOPS, 2000 write IOPS. (8) Read only; based on internal testing. Results may vary based on host device, file attributions and other factors.

Customer reviews

4.8 out of 5 stars
350,945 global ratings

Customers say

Customers like the functionality, value for money, and speed of the flash memory. They mention it works well in a GoPro Hero Black 12 at 4K 60fps, is an excellent choice for anyone who needs reliable and high-performance storage, and provides quick reads and file transfers. Customers also appreciate the storage capacity, saying it's perfect for handling large files and data-intensive tasks. They are also happy with the memory card quality, ease of use, and recording capacity.

AI-generated from the text of customer reviews

1,861 customers mention "Functionality"1,680 positive181 negative

Customers are satisfied with the functionality of the flash memory. They mention it runs nice in their PS4 and Nintendo Switch consoles. Some say it's adequate for normal use in cell phones or laptops.

"...Here’s a detailed review of its features, performance, and overall value.#### Design and Build Quality..." Read more

"...to report that I have had no more issues with lagging video and no issues in general." Read more

"Works great. Used it to expand Nintendo Switch OLED memory. Fast and easy" Read more

"...The Amazon basic seems a good value and is certainly adequate for normal use in a cell phone or laptop...." Read more

1,099 customers mention "Value for money"949 positive150 negative

Customers appreciate the value of the flash memory. They mention it's simple to use and has great value.

"...While it comes at a premium price, the performance and durability justify the investment, ensuring that your data is both accessible and secure." Read more

"...before you have to empty the card and it also seems like the most cost-effective price in regards to the bigger and smaller micro SD cards...." Read more

"...consistent load/unload cycles like I put mine through, but they are cheap to buy and hold a ton of info...." Read more

"...The Amazon basic seems a good value and is certainly adequate for normal use in a cell phone or laptop...." Read more

1,079 customers mention "Quality"898 positive181 negative

Customers like the quality of the product. They mention it's very reliable and an excellent choice for anyone who needs reliable and high-performance storage. Some say it'll hold up well and is perfect for temporarily or permanent use for Android smartphones.

"...Design and Build QualitySanDisk has built a reputation for reliable and durable memory products, and the 128GB Extreme microSDXC UHS-I..." Read more

"...The durability of the card is also impressive, as it’s built to withstand harsh conditions like extreme temperatures, water, and shock...." Read more

"...looking for, and even needed, price was fine, quality was good, specs was solid, everything was good! So yeah solid buy in all honesty...." Read more

"Very good product I use it for my drone very pleased" Read more

1,006 customers mention "Speed"862 positive144 negative

Customers like the speed of the flash memory. They mention it's always fast to read and write, can keep up with the bit rate of the camera, and result in smooth recording. It improves the performance of their phones and is easy to transfer items onto it.

"...to 160MB/s and write speeds of up to 90MB/s. These speeds are particularly beneficial for tasks that require fast data transfer, such as shooting 4K..." Read more

"...for over a month, I am happy to report that I have had no more issues with lagging video and no issues in general." Read more

"Works great. Used it to expand Nintendo Switch OLED memory. Fast and easy" Read more

"...It is a storage tool, like most, it is easy to transfer items onto it...." Read more

872 customers mention "Storage capacity"787 positive85 negative

Customers are satisfied with the storage capacity of the flash memory. They mention it gives them plenty of storage before they have to empty the card. They also mention it's perfect for handling large files and data-intensive tasks. Customers also say it'll be a reliable and high-performance storage solution for various devices. They say it works with the advertised capacity and is a great way to extend space for cameras and other devices.

"...GB Extreme microSDXC UHS-I Memory Card with Adapter is a high-performance storage solution designed to meet the demands of professional photographers..." Read more

"...128GB gives you plenty of storage before you have to empty the card and it also seems like the most cost-effective price in regards to the bigger..." Read more

"There is not much you can say in a review about this product. It is a storage tool, like most, it is easy to transfer items onto it...." Read more

"...Comes with an adapter for added versatilityAmple 128GB storage capacityCons:None so far!..." Read more

368 customers mention "Memory card quality"300 positive68 negative

Customers like the memory card quality. They mention it's a great SDXC card, excellent, and reliable. Some say it'll function properly without any issues and is perfect for micro SD card applications.

"Good micro sd card for its value overall" Read more

"I thought SD cards were all the same. I was wrong. This SD card is fantastic, it does not have any issues with compatibility and many of devices..." Read more

"Fast,reliable Micro SD Cards for up to 4K filming (U3/ Class10).For Value sake:..." Read more

"...Obviously that's of no fault of the card. The card itself has been great." Read more

219 customers mention "Ease of use"206 positive13 negative

Customers find the flash memory easy to install and use. They mention it takes very little time to do so, is easier to handle, and can't cause damage to a phone or tablet. They also mention it works immediately out of the box.

"Works great. Used it to expand Nintendo Switch OLED memory. Fast and easy" Read more

"...The included adapter is a nice bonus, making it easy to use this microSD card in a variety of devices...." Read more

"...few USB-C to USB-A adapters and micro SD card reader, it's easy to do on the Deck itself...." Read more

"...It is easier to handle and can't cause damage to a phone or tablet like USB C flash driver or USB C card readers...." Read more

177 customers mention "Recording capacity"159 positive18 negative

Customers like the recording capacity of the flash memory. They mention it takes great normal video and photos as well as 4K capture. The video playback is excellent, and the transfer speed is fast, making it ideal for capturing and transferring high-resolution content quickly. The card is excellent and really allows awesome videos.

"...Video Speed Class 30 (V30) ratings confirm its suitability for high-resolution video recording and smooth playback.####..." Read more

"...Blazing fast transfer speeds up to 160MB/sPerfect for 4K video recording and high-res photography..." Read more

"...So far the video quality is amazing and the speed of transferring data has been great too.Over all I would recommend it!" Read more

"...and write speeds of up to 90MB/s, making it ideal for capturing and transferring high-resolution content quickly...." Read more

Missing adapter
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I received my sd card but there is no adapter. I wish I can receive a partial or full refund.
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Top reviews from the United States

Reviewed in the United States on July 28, 2024
Style: Card OnlyCapacity: 128GBVerified Purchase
### SanDisk 128GB Extreme microSDXC UHS-I Memory Card with Adapter Review

The SanDisk 128GB Extreme microSDXC UHS-I Memory Card with Adapter is a high-performance storage solution designed to meet the demands of professional photographers, videographers, and tech enthusiasts. Here’s a detailed review of its features, performance, and overall value.

#### Design and Build Quality

SanDisk has built a reputation for reliable and durable memory products, and the 128GB Extreme microSDXC UHS-I card is no exception. The card is constructed to withstand harsh conditions, including water, shock, temperature extremes, and X-rays. Its robust build ensures that your data remains safe and intact even in challenging environments.

#### Performance

The performance of this memory card is impressive, boasting read speeds of up to 160MB/s and write speeds of up to 90MB/s. These speeds are particularly beneficial for tasks that require fast data transfer, such as shooting 4K UHD videos, burst mode photography, and rapid app loading. The card’s UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) ratings confirm its suitability for high-resolution video recording and smooth playback.

#### Capacity

With 128GB of storage, this card offers ample space for storing thousands of photos, hours of video footage, and numerous apps and files. This capacity is ideal for users who need to store large amounts of data without frequently swapping out cards.

#### Versatility and Compatibility

The included adapter enhances the versatility of the SanDisk Extreme microSDXC card, allowing it to be used in a variety of devices, including smartphones, tablets, action cameras, drones, and more. The adapter also makes it easy to transfer data to a computer or other devices with a standard SD card slot.

#### Reliability and Support

SanDisk provides a lifetime warranty with this memory card, demonstrating their confidence in its longevity and performance. Additionally, the card comes with downloadable RescuePRO Deluxe data recovery software, which can help recover files that are accidentally deleted.

#### Pros and Cons

**Pros:**

- High read and write speeds (up to 160MB/s and 90MB/s, respectively)
- Durable design with resistance to water, shock, temperature, and X-rays
- Large 128GB storage capacity
- Includes adapter for greater compatibility
- Lifetime warranty and data recovery software

**Cons:**

- Actual speeds may vary depending on the device and usage conditions
- Higher cost compared to standard microSD cards (justified by performance and durability)

### Conclusion

The SanDisk 128GB Extreme microSDXC UHS-I Memory Card with Adapter is a standout choice for anyone needing high-speed, reliable storage. Its combination of fast read and write speeds, robust build quality, and ample storage capacity make it ideal for professional use and demanding applications. While it comes at a premium price, the performance and durability justify the investment, ensuring that your data is both accessible and secure.
Reviewed in the United States on August 9, 2024
Style: Card OnlyCapacity: 128GBVerified Purchase
I recently started experiencing issues with my GoPro video recordings and realized that it was because the micro SD card that I was using in my GoPro did not have the correct read and write speeds to keep up with the 4k 60FPS recording. The Sandisk Extreme cards are one of the recommended cards on the GoPro official website to use for recordings and were one of the reasons that I got this card. 128GB gives you plenty of storage before you have to empty the card and it also seems like the most cost-effective price in regards to the bigger and smaller micro SD cards. I briefly looked at the Sandisk Pro line-up of cards which is supposed to be the next step up after the ultimate series but discovered that there are very minute differences, if any, and do not justify the cost bump to get that one. After using this for over a month, I am happy to report that I have had no more issues with lagging video and no issues in general.
Reviewed in the United States on September 4, 2024
Style: Card OnlyCapacity: 512GBVerified Purchase
Works great. Used it to expand Nintendo Switch OLED memory. Fast and easy
Reviewed in the United States on June 4, 2024
Style: Card OnlyCapacity: 128GBVerified Purchase
There is not much you can say in a review about this product. It is a storage tool, like most, it is easy to transfer items onto it. I mainly use for my music; I load the music and stick this card in my MP-3 player. I currently have over 5000 songs on it, and it has barely used any space. Like all cards, they do wear out with consistent load/unload cycles like I put mine through, but they are cheap to buy and hold a ton of info. The only problem I have had with this card, it likes to hide from me. Keep a little cup or bowl nearby so when you take it out of your player, phone or other devices so it doesn't run away.
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Reviewed in the United States on May 12, 2019
Style: Card OnlyCapacity: 128GBVerified Purchase
I am reviewing and comparing two different memory cards, the Amazon basics 256gb and the SanDisk Extreme 256gb card.

First is price, the Amazon basics is a several dollars less than the SanDisk (at this moment 23.72 vs 36.99). Currently Amazon says there is a newer version of the SanDisk for 24.85, however I have not purchased or tested the newer version.

The two cards:
"SanDisk 256GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-256G-GN6MA"
"Amazon Basics microSDXC Memory Card with Full Size Adapter, A2, U3, Read Speed up to 100 MB/s, 256 GB"

Tested using:
CrystalDiskMark 5.5.0 x64.
Computer is a 4-year-old "NUC8i7HVK" running Windows 10, and it has a built in SD card reader (Intel calls it "SDXC with UHS-I support"). This interface is what I call "SD reader" in the accompanying screen captures.
I also tested using a SanDisk USB 3 adapter "SanDisk MobileMate USB 3.0 microSD Card Reader- SDDR-B531-GN6NN". This interface is what I call USB3 in the accompanying screen captures.

First, I noticed a UK review where the reviewer noted the Amazon basics card seems to be missing 5 gigabytes of storage even when the (confusing) translation from computer storage gigabytes (1024 x 1024 x 1024 = 1,073,741,824 bytes vs 1000 x 1000 x 1000 = 1,000,000,000 bytes) vs "we sell storage" gigabytes.
You will notice CrystalDiskMark reports the Amazon basic card as 233GiB versus the 238GiB of the SanDisk, so he is very correct. I have no clue why the discrepancy, but it is slightly smaller than it should be.

Second, to get the real read/write speed of the SanDisk card, you will notice I had to use the SanDisk USB 3 adapter. Using the built in SD card reader, both cards were very close to identical results.
Using the SanDisk USB 3 adapter, I did manage to exceed the ratings for the SanDisk card (up to 160 MB/s read, and up to 90 MB/s write) giving 169 read and 105 write. The Amazon basic card did have a slight change using the SanDisk adapter, but really not significant.

Both cards were close enough to their claimed specs to not worry about it, however it should be noted that you need the SanDisk adapter to actually get the much higher speeds of the SanDisk.
I will be using the Amazon basic card to store children's movies for my granddaughter to play on her new Kindle, it is plenty fast enough reading to do full HD movies.

Note that both cards were brand new when tested and had never had anything written or read from them prior to the test. The Amazon basic seems a good value and is certainly adequate for normal use in a cell phone or laptop. The SanDisk would really shine if you used the adapter to move lots of larger files to it.

Older review:
I've now purchased this card 3 times from Amazon (as seller) and I'm very satisfied. Used in Moto g7 and Moto g7 power phones with excellent results!
Mine was sold by Amazon, and certainly is a fast card. Installed in a Moto G7, tested at 89 read, 59 write using A1 SD benchmark for android. Maybe not the rated speed, but Motorola phones have a history of bad SD compatibility. Tested others, and this card is significantly faster. Very happy with the product.
Note that I've attached some results testing on a PC with a Lexmark reader, thus it doesn't attain its full speed.
Customer image
5.0 out of 5 stars Test results - Amazon basic 256 vs SanDisk Extreme 256 (with earlier cell phone usage review)
Reviewed in the United States on May 12, 2019
I am reviewing and comparing two different memory cards, the Amazon basics 256gb and the SanDisk Extreme 256gb card.

First is price, the Amazon basics is a several dollars less than the SanDisk (at this moment 23.72 vs 36.99). Currently Amazon says there is a newer version of the SanDisk for 24.85, however I have not purchased or tested the newer version.

The two cards:
"SanDisk 256GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-256G-GN6MA"
"Amazon Basics microSDXC Memory Card with Full Size Adapter, A2, U3, Read Speed up to 100 MB/s, 256 GB"

Tested using:
CrystalDiskMark 5.5.0 x64.
Computer is a 4-year-old "NUC8i7HVK" running Windows 10, and it has a built in SD card reader (Intel calls it "SDXC with UHS-I support"). This interface is what I call "SD reader" in the accompanying screen captures.
I also tested using a SanDisk USB 3 adapter "SanDisk MobileMate USB 3.0 microSD Card Reader- SDDR-B531-GN6NN". This interface is what I call USB3 in the accompanying screen captures.

First, I noticed a UK review where the reviewer noted the Amazon basics card seems to be missing 5 gigabytes of storage even when the (confusing) translation from computer storage gigabytes (1024 x 1024 x 1024 = 1,073,741,824 bytes vs 1000 x 1000 x 1000 = 1,000,000,000 bytes) vs "we sell storage" gigabytes.
You will notice CrystalDiskMark reports the Amazon basic card as 233GiB versus the 238GiB of the SanDisk, so he is very correct. I have no clue why the discrepancy, but it is slightly smaller than it should be.

Second, to get the real read/write speed of the SanDisk card, you will notice I had to use the SanDisk USB 3 adapter. Using the built in SD card reader, both cards were very close to identical results.
Using the SanDisk USB 3 adapter, I did manage to exceed the ratings for the SanDisk card (up to 160 MB/s read, and up to 90 MB/s write) giving 169 read and 105 write. The Amazon basic card did have a slight change using the SanDisk adapter, but really not significant.

Both cards were close enough to their claimed specs to not worry about it, however it should be noted that you need the SanDisk adapter to actually get the much higher speeds of the SanDisk.
I will be using the Amazon basic card to store children's movies for my granddaughter to play on her new Kindle, it is plenty fast enough reading to do full HD movies.

Note that both cards were brand new when tested and had never had anything written or read from them prior to the test. The Amazon basic seems a good value and is certainly adequate for normal use in a cell phone or laptop. The SanDisk would really shine if you used the adapter to move lots of larger files to it.

Older review:
I've now purchased this card 3 times from Amazon (as seller) and I'm very satisfied. Used in Moto g7 and Moto g7 power phones with excellent results!
Mine was sold by Amazon, and certainly is a fast card. Installed in a Moto G7, tested at 89 read, 59 write using A1 SD benchmark for android. Maybe not the rated speed, but Motorola phones have a history of bad SD compatibility. Tested others, and this card is significantly faster. Very happy with the product.
Note that I've attached some results testing on a PC with a Lexmark reader, thus it doesn't attain its full speed.
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Roberto Cuevas Martínez
5.0 out of 5 stars Súper!
Reviewed in Mexico on September 3, 2024
Style: Card OnlyCapacity: 512GBVerified Purchase
Excelente producto y vendedor. Llegó a tiempo y funciona perfecto
Maicon
5.0 out of 5 stars Excelente
Reviewed in Brazil on August 24, 2024
Style: Card OnlyCapacity: 512GBVerified Purchase
O produto é ótimo. Recomendo
Pascal Grenier
5.0 out of 5 stars My expectations were high
Reviewed in Canada on December 28, 2023
Style: Card OnlyCapacity: 128GBVerified Purchase
I picked up the SanDisk Extreme microSDXC memory card a few months ago, motivated by its excellent reputation for reliability and performance. My expectations were high: a card capable of handling large files quickly, ideal for cameras, drones or smartphones.

Using this card was a real pleasure. Its high transfer speed allowed me to move and access my files quickly, which is crucial when you don't want to waste a moment. However, I noted that in extreme conditions its performance may fluctuate slightly.

In terms of quality, the SanDisk Extreme does not disappoint. It resists shock, water and extreme temperatures, making it a perfect choice for adventurers. Its performance is up to par, with competitive read and write speeds.

Highlights: high speed, durable, large storage capacity.
Cons: Slightly inconsistent performance in extreme conditions, somewhat high price.

Compared to other microSD cards on the market, the SanDisk Extreme stands out for its speed and reliability. However, for those looking for a more economical option, brands like Kingston or Samsung offer interesting alternatives.

To maintain its performance, I recommend formatting the card regularly and storing it in a dry place at room temperature.

Technical details
- Capacity: up to 1 TB.
- Reading speed: up to 160 MB/s.
- Resistance to the elements: waterproof, shock and temperature resistant.

For optimal performance, use this card with devices that support UHS-I. It is ideal for recording and playing 4K videos.

The SanDisk Extreme microSDXC memory card is an excellent choice for those looking for speed and reliability. It represents a safe investment for enthusiasts of photography, videography or simply to increase the storage of their smartphone.
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yasser alazeze
5.0 out of 5 stars ممتازه
Reviewed in Saudi Arabia on September 5, 2024
Style: Card OnlyCapacity: 128GBVerified Purchase
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Rahul
5.0 out of 5 stars Review: SanDisk 128GB Extreme microSDXC Card
Reviewed in India on May 17, 2024
Style: Card OnlyCapacity: 128GBVerified Purchase
Performance:
The performance of this card is impressive, with read speeds of up to 160MB/s and write speeds of up to 90MB/s. While it is not the fastest on the market, it is more than sufficient for most tasks, including 4K video recording and high-resolution photography. The speed ratings of U3, C10, V30, and UHS-I make it a reliable choice for handling large files and intensive data tasks.

Usability:
One of the standout features of the SanDisk Extreme microSDXC card is its A2 rating, which signifies excellent app performance. This makes it an ideal choice for expanding storage on smartphones and tablets, ensuring apps run smoothly without significant lag.

Quality and Reliability:
SanDisk has a well-established reputation for producing high-quality memory products, and this card is no exception. It feels robust and durable, giving confidence that my data is secure. It’s also designed to be resistant to water, temperature extremes, shock, and X-rays, which adds an extra layer of protection for my data.

Cost:
While this card is on the pricier side, the cost is justified by its performance and reliability. For those who need a dependable and fast microSDXC card for high-stakes tasks like 4K video recording or extensive app usage, the extra expense is worth it.

Data Transfer Speeds:
Though the card boasts impressive speeds, I found that it is not the absolute fastest when it comes to data transfer. However, the speeds it offers are still very good and adequate for most users. Transferring large files and video footage is smooth, though if you require the fastest possible speeds, you might want to look at other high-end options.

Conclusion:
The SanDisk 128GB Extreme microSDXC card is a high-quality, reliable, and fast storage solution. It is particularly suited for users who need robust performance for 4K video, high-resolution photography, and app storage. While it is not the fastest card available and comes with a higher price tag, its overall performance and durability make it a worthwhile investment.