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Lexar Professional 1000x 64GB microSDXC UHS-II Card (LSDMI64GCBNA1000A)

4.5 4.5 out of 5 stars 1,925 ratings

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64 GB

Purchase options and add-ons

Brand Lexar
Flash Memory Type Micro SDXC
Memory Storage Capacity 64 GB
Compatible Devices Tablet, Smartphone
Color Brown, White

About this item

  • High-speed performance—leverages UHS-II technology (U3) for a read transfer Speed up to 150MB/s (1000x)
  • Premium memory solution for sports camcorders, tablets, and smartphones
  • Designed for high-speed capture of high-quality images and extended lengths of 1080P full-HD, 3D, and 4K video
  • Backwards compatible with UHS-I devices, Performing up to the maximum thresholds of UHS-I speed capabilities (SDR104)
  • Limited Lifetime product support for card
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Lexar Professional 1000x 64GB microSDXC UHS-II Card (LSDMI64GCBNA1000A)
Lexar Professional 1000x 64GB microSDXC UHS-II Card (LSDMI64GCBNA1000A)
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Customer Ratings
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4.2
4.6
4.6
4.6
4.7
4.6
Value for money
3.9
4.5
4.5
4.3
4.6
4.5
Easy to install
4.7
4.7
4.7
4.8
4.7
Easy to use
4.4
5.0
5.0
5.0
Durability
3.6
4.6
4.6
4.6
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flash memory type
Micro SDXC
Micro SDXC
Micro SDXC
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Micro SDXC
memory capacity
64 GB
128 GB
512 GB
64 GB
128 GB
256 GB
speed class
class 10
class 10
class 10
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class 10
class 10
write speed
150 MB per second
90
90MB/s
90MB/s
130 MB per second
read speed
90 megabytes per second
190 megabytes per second
190 megabytes per second
200 megabytes per second
200 megabytes per second
190 megabytes per second

From the manufacturer

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Lexar Professional 1000x microSD UHS-II Card

Professional-level performance for mobile device users

Hero Product

Lexar Professional 1000x microSDHC/microSDXC UHS-II Cards

Professional-level performance for mobile device users

Whether you’re a professional photographer, videographer, or a mobile device power user, Lexar Professional 1000x microSDHC/microSDXC UHS-II Cards provide performance you can trust. These high-speed cards leverage UHS-II (U3) technology and provide a read transfer speed up to 150MB/s (1000x) (1). These premium memory solutions give you the speed and capacity you need to capture, transfer, and share more adventures on the go.

  • High-speed performance—UHS-II technology (U3) for a read transfer speed up to 150MB/s (1000x) (1)
  • Premium memory solution for sports camcorders, tablets, and smartphones
  • Designed for high-speed capture of high-quality images and extended lengths of Full-HD, 3D, 4K video
  • Backwards compatible with UHS-I devices, performing up to the maximum thresholds of UHS-I speed
  • Backed by expert support

Module 1

Module 2

Module 3

Module 2

Capture adventures in 4K

Whether you’re shooting with your action camera or drone, you can quickly capture, play back, and transfer extended lengths of the highest quality 1080p Full-HD, 3D, and 4K video—making it easy to preserve more than 36 hours of your greatest moments and then relive the action (2).

Do more with your multimedia

Great for use with your action camera or smartphone, the cards make it easy to quickly download or save all your favorite media files, including the highest-quality movies, photos, and songs.

Backwards compatible at the highest UHS-I speeds

For versatility, the cards are also backwards compatible with UHS-I devices, performing up to the maximum thresholds of UHS-I speed capabilities. The cards also work with older, non-UHS-I devices, performing at Class 10 speeds.

Save time with dramatically accelerated workflow

The high-speed performance of Lexar Professional 1000x microSDHC/microSDXC UHS-II Cards dramatically accelerate your workflow from start to finish so you can save time, beat your deadline and gain a competitive edge.

Logo

(1) Up to 150MB/s read transfer, write speeds lower. Speeds based on internal testing. Actual performance may vary. x=150KB/s

(2) Based on 256GB capacity. HD 1080p@24fps (15 Mbps). Actual number of hours will vary depending on camera/device model, format resolution and compression, usable capacity, and bundled software.

633x microSD 667x microsd 1000x microSD 1800x microSD
33x microSD UHS-I Card 667x microSD UHS-I Card 1000x microSD UHS-II Card 1800x microSD UHS-II Card
Customer Reviews
4.6 out of 5 stars
13,003
4.6 out of 5 stars
1,458
4.5 out of 5 stars
1,925
4.6 out of 5 stars
643
Ideal for Mainstream photo/video enthusiasts, smartphones, tablets, action cams, drones users Mainstream photo/video enthusiasts, smartphones, tablets, action cams, drones users Professional photographers/videographers, action cams, drones or high-end smartphone users Professional photographers/videographers, action cams, drones or high-end smartphone users
Read Speed (Up To) 100MB/s 100MB/s 150MB/s 270MB/s
Write Speed (Up To) 70MB/s 90MB/s 90MB/s 150MB/s
Speed Class C10, U1/U3, V10/V30, (depending on capacity) C10, U3, V30 C10, U3, V60 C10, U3, V90
Interface UHS-I UHS-I UHS-II UHS-II
Video Recording Full HD, 3D, 4K UHD (4K only for 64GB and up) Full HD, 3D, 4K UHD Full HD, 3D, 4K UHD Full HD, 3D, 4K UHD
App Rating A1 (32GB ‒ 256GB); A2 (512GB) A2 N/A N/A
Compatible With Smartphones, tablets, cameras, drones, action cameras Smartphones, tablets, cameras, drones, action cameras Cameras, drones, action cameras Cameras, drones, action cameras
Available Capacities 32GB ‒ 512GB 64GB ‒ 256GB 32GB ‒ 256GB 64GB ‒ 128GB

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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.
Product Warranty: For warranty information about this product, please click here

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Lexar Professional 1000x 64GB microSDXC UHS-II Card (LSDMI64GCBNA1000A)


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Product Description

Designed for your sports camcorder, tablet, or smartphone, Lexar professional 1000x microSDHC/microSDXC UHS-II cards let you quickly capture, play back, and transfer multimedia files, including 1080P full-HD, 3D, and 4K video, with a read transfer Speed up to 1000x (150MB/s). the cards leverage UHS-II technology (UHS speed Class 3 (U3)) for high-speed performance.

Customer reviews

4.5 out of 5 stars
4.5 out of 5
1,925 global ratings

Customers say

Customers like the quality, speed and value of the flash memory. They mention that the memory is within the advertised range, it's large for data logging and that the USB reader is also a really nice bonus. They appreciate the ease of installation. That said, some complain about the heat. Opinions are mixed on performance, and size.

AI-generated from the text of customer reviews

300 customers mention218 positive82 negative

Customers like the quality of the flash memory. They say it's fast, affordable, and an excellent SD card. Customers also say that the memory values are within the advertised range, and the USB reader is a really nice bonus. They also mention that the card is plenty fast and large for data logging, and has no storage space left over. Customers are also impressed with the included USB3+UHSII adapter.

"...High-quality, USB 3 readers of this form factor are not very common. I like to use them as flash drive replacements (I leave the cards in them)...." Read more

"...The USB reader is also a really nice bonus." Read more

"...The card is plenty fast and large for data logging with an Intrepid Control Systems neoVI Fire. There's not much else to say on that front...." Read more

"...It scares me away just to imagine the card fails to read after a long trip with a large amount of photos and videos...." Read more

229 customers mention195 positive34 negative

Customers generally like the speed of the flash memory. They say that the read/write speeds are incredibly fast, and even with almost 45 gigs of music, they've got a difference in upload time worth it. The read performance is great, and using the included USB reader, they were able to get 140MB/s. The USB adapter has far better performance than the SD adapter that comes with most of the devices. The phone boots fine and their photos all load perfectly, and the card saves time.

"Read performance is great -- using the included USB reader I was able to get 140MB/s read...." Read more

"...While Lexar X1000 can provide much faster download speed and pretty good writing speed." Read more

"...I do this for three reasons: microSD cards are far faster than any USB flash drive I have ever researched except a few very large and expensive ones..." Read more

"...The phone boots fine and my photos all load perfectly...." Read more

74 customers mention62 positive12 negative

Customers like the value of the flash memory. They mention it has a great price, it's flexible, and has incredibly high-end performance. The USB reader makes it a good deal.

"...reader, Samsung Evo is good choice for its good performance and cheap price...." Read more

"Slower than V60 but the price is OK." Read more

"...The price was good too...." Read more

"...this card to anyone and everyone who's looking for a very fast, affordable and excellent SD card." Read more

30 customers mention28 positive2 negative

Customers find the installation process of the flash memory to be easy. They mention that the USB adapter is easy to use, and the card is fast. Customers also appreciate the convenience of plugging and playing the flash card. Overall, customers are satisfied with the ease of installation of the product.

"...It is durable, attractive, and very fast, and has given me no trouble. There was one instance when I thought it had gone bad...." Read more

"...on a regular USB port (no need to have a card reader) and it is easy to use. It also works with other brands of Micro SD." Read more

"...this takes much less time. When you have to install a 6GB to 10GB ROM on to a smartphone,..." Read more

"good performance, compatible with all micro sd’s easy to use.the micro sd itself is good...." Read more

26 customers mention22 positive4 negative

Customers like the compatibility of the flash memory. They mention that it's great for GoPro hero black 4 and other brands of Micro SD. It also works with DJI drones, GoPro Hero 4 and 5 black, and all computers. Customers also say that it is easy to use and works with all microSD.

"...It also works with other brands of Micro SD." Read more

"good performance, compatible with all micro sd’s easy to use.the micro sd itself is good...." Read more

"So far so good. Works in my GoPro Hero5 Black where the SanDisk that came with the camera only gave errors...." Read more

"Awesome price for 128gb on micro SD. Works with GoPro hero 5 black and the USB card reader is very quick for downloading...." Read more

321 customers mention215 positive106 negative

Customers are mixed about the performance of the flash memory. Some mention that it works flawlessly, while others say that it failed again. Some of the worst performing cards in this review also happen to be the most expensive. The card reader stopped working and became unresponsive, making it impossible for them to backup their 100+ GB of data.

"...using USB2.0 card reader, Samsung Evo is good choice for its good performance and cheap price...." Read more

"...There's not much else to say on that front. It works for the intended purpose...." Read more

"...Some of the worst performing cards in this review also happen to be the most expensive.Not all 633x cards are created equal...." Read more

"...Works great with go pro. The 128GB reads as 11+ hours of footage availability on the highest quality footage on Go Pro!" Read more

29 customers mention18 positive11 negative

Customers are mixed about the size of the adapter. Some mention that they want a very small size and only the one slot. The adapter is a perfect way to get it into their laptop and keep travel weight to a minimum. However, others say that their laptop would not register the size and that it does not fit other cards. They are disappointed that it cannot format and that the adaptor does not work with their camera.

"...The features I want in such a reader are:- Very small size and only the one slot.- USB 3 speed.- Lanyard loop.-..." Read more

"...The card reader is super tiny so I would suggest a string or something to have it in so it doesn't get lost. Works great with go pro...." Read more

"...Very cute and small, but totally unreliable." Read more

"...Out of the box, it worked great. Just what I needed. It formatted quickly and without problems...." Read more

31 customers mention0 positive31 negative

Customers are not satisfied with the heat of the flash memory. They mention that it overheats and does not read with the reader.

"...USB3.0 reader can keep a constant write/read high speed, though it gets very hot while transferring full 32G data...." Read more

"...I plugged it into my Mac, it got stuck during the transfer and became very hot...." Read more

"...#3. When I took the USB adapter out of my Lenovo Y470 laptop, it was VERY Hot...." Read more

"...It has one problem. It overheats. I use it in a dash cam. The card gets hot and heats up the whole camera. It has not damaged anything...." Read more

Lexar 1000x microSDHC: Good but not Great.  Actually pretty decent.
5 Stars
Lexar 1000x microSDHC: Good but not Great. Actually pretty decent.
Read performance is great -- using the included USB reader I was able to get 140MB/s read. Write speed on the other hand is disappointing, again using the included USB card reader, I was only getting 40MB/s.Update: retested this on a PC running Windows 10. Previous test was done on an iMac and I mistakenly made the assumption that the test result on iMac would be comparable to test results posted by others using CrystalDiskMark. A sequential write speed of around 60MB/s was obtained on a PC, making it a significant improvement of write speed over the blue colored 633x card. I am updating the score to 5 stars.Realizing that the benchmark results posted by other folks are not necessarily directly comparable to mine I set out to create a comprehensive list of current microSD cards on the market. The results are below.---------------------------------------------------------------------------------------------I had the opportunity to compare the performance of the fastest microsd cards currently available from top manufacturers. All cards mentioned in this review are obtained from Amazon during the last week or two except when noted otherwise.Test Setup:Lexar Professional workflow UR1 microsd card reader was used for all tests except when notedCrystalDiskMark 5.0.2 x64 was used to produce all the test results and was set up with 2 passes and 100MB read/write sizeAll cards up to 32GB are formatted as FAT32 with 32KB allocation unit size, all 64GB cards are formatted exFAT with 128KB allocation unit sizeTest Results (Numbers are Sequential Read, Sequential Write, 4K Random Read, 4K Random Write in MB/s, speeds greater than 10MB/s were rounded to the whole numbers)16 GB AlphabeticallyLexar 633x** -- 88, 25, 8.7, 1.2Panasonic U3** -- 93, 42, 11, 0.7Sandisk Extreme Pro -- 95, 80, 7.6, 2.632 GB AlphabeticallyDelkin U3 -- 93, 59, 11, 0.6Kingston 90R/80W -- 93, 58, 11, 0.6Lexar 1000x -- 90, 57, 10, 1.4 <== the listed productLexar 1000x with Bundled Reader* -- 148, 60, 10, 1.4 <== the listed productPatriot EP -- 90, 35, 10, 0.6PNY Turbo Performance -- 91, 55, 6.9, 0.9PNY Elite Performance Lime Green -- 94, 55, 7.4, 1.0Samsung Pro gray -- 92, 82, 10, 3.6Sandisk Extreme Pro -- 94, 87, 9, 3.0Sony up to 95MB/s -- 91, 51, 4.8, 0.9Transcend Ultimate 633x -- 93, 85, 8.1, 1.464 GB AlphabeticallyDelkin U3 -- 94, 27, 13, 0.3Kingston 90R/80W -- 94, 25, 13, 0.3Lexar 1000x -- 92, 56, 12, 1.5 <== the listed productLexar 1000x with Bundled Reader* -- 153, 66, 11, 1.7 <== the listed productPatriot EP -- 81, 22, 11, 0.6PNY Turbo Performance -- 92, 54, 6.9, 0.9PNY Elite Performance Lime Green -- 92, 54, 7.5, 1.0Samsung black -- 82, 20, 8.8, 2.1Samsung Pro gray -- 90, 80, 10, 3.5Samsung Pro+ *** -- 92, 86, 10, 5.3Sandisk Extreme Plus**** -- 92, 58, 10, 2.8Sandisk Extreme Pro - 97, 91, 10, 3.0Sandisk Ultra ***** -- 46, 16, 7.0, 2.1Sony up to 95MB/s -- 92, 49, 5.2, 0.9Transcend Ultimate 633x -- 93, 83, 7.3, 1.4128 GB AlphabeticallyLexar 633x -- 78, 28, 3.3, 1.4Sandisk Ultra -- 92, 19, 6.4, 2.4* The Lexar 1000x card is the only UHS-II card available and tested, the bundled USB reader has extra pins for reading UHS-II card** Came bundled with a device*** Purchased from a large west coast electronics retailer. This card is a new release and not currently available on Amazon. It is different from the gray-colored Pro card**** old model tested, not the current U3 model***** old model testedFastest Sequential Read:All tested cards were able to accomplish > 90MB/s, with the Lexar 1000x able to take advantage of UHS-II speed when using the bundled USB reader and leading the packFastest Sequential Write:Sandisk Extreme Pro, Samsung Pro+, Transcend Ultimate 633xFastest Random Read:Kingston 90R/80W.Fastest Random Write:Samsung Pro+Best overall:Samsung Pro+ and Sandisk Extreme ProOther observations:Performance and price are not proportional when it comes to selecting a microSD card. Some of the worst performing cards in this review also happen to be the most expensive.Not all 633x cards are created equal. The two cards reviewed from Lexar and Transcend are both marked as 633x but vary in performance greatly.4k video recording using action cams and drone cameras have a typical bitrate of 60mbps or 100mbps, corresponding to 7.5MB/s to 12.5MB/s. All cards in this review should theoretically be able to handle this usage easily.Using microsd card as supplemental phone storage potentially could benefit from a faster card,Best Looking Card (if it matters):Sandisk Extreme Pro: Red/Gold with white printLexar 1000x: White/Gold with Black/White printSamsung Pro+: White/Black with a red stripe and Black/White printPNY Turbo: Lime Green/Black with Black/White printUpdate 9/14/2015: Added additional cards to the list.Update 9/18/2015: Added 128GB Sandisk Ultra and Lexar 633xUpdate 9/21/2015: Added 2 PNY Elite Performance cards
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Top reviews from the United States

Reviewed in the United States on September 5, 2015
Capacity: 32 GBVerified Purchase
Customer image
5.0 out of 5 stars Lexar 1000x microSDHC: Good but not Great. Actually pretty decent.
Reviewed in the United States on September 5, 2015
Read performance is great -- using the included USB reader I was able to get 140MB/s read. Write speed on the other hand is disappointing, again using the included USB card reader, I was only getting 40MB/s.

Update: retested this on a PC running Windows 10. Previous test was done on an iMac and I mistakenly made the assumption that the test result on iMac would be comparable to test results posted by others using CrystalDiskMark. A sequential write speed of around 60MB/s was obtained on a PC, making it a significant improvement of write speed over the blue colored 633x card. I am updating the score to 5 stars.

Realizing that the benchmark results posted by other folks are not necessarily directly comparable to mine I set out to create a comprehensive list of current microSD cards on the market. The results are below.
---------------------------------------------------------------------------------------------
I had the opportunity to compare the performance of the fastest microsd cards currently available from top manufacturers. All cards mentioned in this review are obtained from Amazon during the last week or two except when noted otherwise.

Test Setup:
Lexar Professional workflow UR1 microsd card reader was used for all tests except when noted
CrystalDiskMark 5.0.2 x64 was used to produce all the test results and was set up with 2 passes and 100MB read/write size
All cards up to 32GB are formatted as FAT32 with 32KB allocation unit size, all 64GB cards are formatted exFAT with 128KB allocation unit size

Test Results (Numbers are Sequential Read, Sequential Write, 4K Random Read, 4K Random Write in MB/s, speeds greater than 10MB/s were rounded to the whole numbers)

16 GB Alphabetically
Lexar 633x** -- 88, 25, 8.7, 1.2
Panasonic U3** -- 93, 42, 11, 0.7
Sandisk Extreme Pro -- 95, 80, 7.6, 2.6

32 GB Alphabetically
Delkin U3 -- 93, 59, 11, 0.6
Kingston 90R/80W -- 93, 58, 11, 0.6
Lexar 1000x -- 90, 57, 10, 1.4 <== the listed product
Lexar 1000x with Bundled Reader* -- 148, 60, 10, 1.4 <== the listed product
Patriot EP -- 90, 35, 10, 0.6
PNY Turbo Performance -- 91, 55, 6.9, 0.9
PNY Elite Performance Lime Green -- 94, 55, 7.4, 1.0
Samsung Pro gray -- 92, 82, 10, 3.6
Sandisk Extreme Pro -- 94, 87, 9, 3.0
Sony up to 95MB/s -- 91, 51, 4.8, 0.9
Transcend Ultimate 633x -- 93, 85, 8.1, 1.4

64 GB Alphabetically
Delkin U3 -- 94, 27, 13, 0.3
Kingston 90R/80W -- 94, 25, 13, 0.3
Lexar 1000x -- 92, 56, 12, 1.5 <== the listed product
Lexar 1000x with Bundled Reader* -- 153, 66, 11, 1.7 <== the listed product
Patriot EP -- 81, 22, 11, 0.6
PNY Turbo Performance -- 92, 54, 6.9, 0.9
PNY Elite Performance Lime Green -- 92, 54, 7.5, 1.0
Samsung black -- 82, 20, 8.8, 2.1
Samsung Pro gray -- 90, 80, 10, 3.5
Samsung Pro+ *** -- 92, 86, 10, 5.3
Sandisk Extreme Plus**** -- 92, 58, 10, 2.8
Sandisk Extreme Pro - 97, 91, 10, 3.0
Sandisk Ultra ***** -- 46, 16, 7.0, 2.1
Sony up to 95MB/s -- 92, 49, 5.2, 0.9
Transcend Ultimate 633x -- 93, 83, 7.3, 1.4

128 GB Alphabetically
Lexar 633x -- 78, 28, 3.3, 1.4
Sandisk Ultra -- 92, 19, 6.4, 2.4

* The Lexar 1000x card is the only UHS-II card available and tested, the bundled USB reader has extra pins for reading UHS-II card
** Came bundled with a device
*** Purchased from a large west coast electronics retailer. This card is a new release and not currently available on Amazon. It is different from the gray-colored Pro card
**** old model tested, not the current U3 model
***** old model tested

Fastest Sequential Read:
All tested cards were able to accomplish > 90MB/s, with the Lexar 1000x able to take advantage of UHS-II speed when using the bundled USB reader and leading the pack

Fastest Sequential Write:
Sandisk Extreme Pro, Samsung Pro+, Transcend Ultimate 633x

Fastest Random Read:
Kingston 90R/80W.

Fastest Random Write:
Samsung Pro+

Best overall:
Samsung Pro+ and Sandisk Extreme Pro

Other observations:
Performance and price are not proportional when it comes to selecting a microSD card. Some of the worst performing cards in this review also happen to be the most expensive.
Not all 633x cards are created equal. The two cards reviewed from Lexar and Transcend are both marked as 633x but vary in performance greatly.
4k video recording using action cams and drone cameras have a typical bitrate of 60mbps or 100mbps, corresponding to 7.5MB/s to 12.5MB/s. All cards in this review should theoretically be able to handle this usage easily.
Using microsd card as supplemental phone storage potentially could benefit from a faster card,

Best Looking Card (if it matters):
Sandisk Extreme Pro: Red/Gold with white print
Lexar 1000x: White/Gold with Black/White print
Samsung Pro+: White/Black with a red stripe and Black/White print
PNY Turbo: Lime Green/Black with Black/White print

Update 9/14/2015: Added additional cards to the list.
Update 9/18/2015: Added 128GB Sandisk Ultra and Lexar 633x
Update 9/21/2015: Added 2 PNY Elite Performance cards
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469 people found this helpful
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Reviewed in the United States on March 15, 2016
Capacity: 32 GBVerified Purchase
2 people found this helpful
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Reviewed in the United States on February 24, 2018
Capacity: 32 GBVerified Purchase
Customer image
5.0 out of 5 stars Card reader is not ideal as a permanent flash drive replacement
Reviewed in the United States on February 24, 2018
I bought this largely because of the great-looking microSD card reader that came with it. High-quality, USB 3 readers of this form factor are not very common. I like to use them as flash drive replacements (I leave the cards in them). I do this for three reasons: microSD cards are far faster than any USB flash drive I have ever researched except a few very large and expensive ones (I paid only $20 for this in Jan. 2017); the microSD card can be removed and inserted into other devices such as phones and media players to exchange files, making the device much more versatile; if the USB device is damaged, I can reuse the microSD card in another device.

The features I want in such a reader are:
- Very small size and only the one slot.
- USB 3 speed.
- Lanyard loop.
- Secure mounting of the microSD card with no risk of it falling out or being damaged while hanging from a lanyard or being kept in a pocket or backpack.
- Activity light.

This reader meets only the first three criteria. The card hangs part way out of the reader when fully inserted (see my photo), and while it is fairly secure in the slot, I do not feel that it is quite secure enough never to work its way out. (I use a small piece of adhesive tape on the top face of the reader that reaches around the back edge of the card to hold it in.) There is also no activity light.

Aside from that, I like it a lot. It is durable, attractive, and very fast, and has given me no trouble. There was one instance when I thought it had gone bad. I relate this story to help anyone else who encounters something similar with any device. A few days ago I inserted the reader into my computer's USB 2.0 port and the screen went dark and the computer became unresponsive and did not recover. I rebooted the computer and from then on the reader would not work properly in it. Windows 7 recognized that something had been plugged in, but the card's partition and data were not recognized. Computer Management would not even allow me to assign a drive letter to the device.

To cut the story short, the only problem was that the default Windows driver for the device had somehow gone corrupt. The device worked on all other computers and when I launched Device Manager, I found an "unrecognized storage device". I uninstalled the driver and then reinstalled it, and the reader has worked ever since. I have never seen this happen before.

So try reinstalling the driver (or using an alternate computer) before deciding that a device has gone bad.
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Reviewed in the United States on December 28, 2016
Capacity: 64 GBVerified Purchase
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5.0 out of 5 stars Works great in my Galaxy S5
Reviewed in the United States on December 28, 2016
I originally bought a Silicon Power 128GB up to 75MB/s MicroSDXC UHS-1 Class10 for my Samsung Galaxy S5 but had lots of problems with the card causing slowness and boot issues, it also corrupted some of my photos. I returned the Silicon Power card and traded some space for better quality and bought this Lexar Pro 1000x 64GB. I have had none of the issues with this card that I did with the Silicon Power. The phone boots fine and my photos all load perfectly. With our lives being mostly on our phones these days I recommend spending more money on a quality card like this so you don't risk losing those precious memories. The USB reader is also a really nice bonus.
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Benjamin
5.0 out of 5 stars Works really well.
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Capacity: 256 GBVerified Purchase
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trev
5.0 out of 5 stars GREAT *****
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5.0 out of 5 stars De las mejores en este campo.
Reviewed in Mexico on April 25, 2017
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Tan B.
1.0 out of 5 stars Bad product
Reviewed in Singapore on December 9, 2020
Capacity: 256 GBVerified Purchase
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Tan B.
1.0 out of 5 stars Bad product
Reviewed in Singapore on December 9, 2020
Very disappointed after format only 233 GB not 256GB
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