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  • Your Rescue Plan documents will be sent to you via email to the address associated with your Amazon.com account and can be found in your account message center within the Buyer/Seller Messages.
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SanDisk 400GB Ultra MicroSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-400G-GN6MA

4.8 4.8 out of 5 stars 28,131 ratings
$62.99
FREE Returns
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Purchase options and add-ons

Brand Sandisk
Model Name SDSQUAR-400G-GN6MA
Flash Memory Type Micro SDXC
Memory Storage Capacity 400 GB
Compatible Devices Tablet, Camera, Smartphone

About this item

  • Ideal for Android smartphones and tablets, and MIL cameras
  • Capacities up to 512GB (1GB=1,000,000,000 bytes. Actual user storage less.) to store even more hours of Full HD video (Approximations; results and Full HD (1920x1080) video support may vary based on host device, file attributes and other factors.)
  • Up to 100MB/s transfer read speed (Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.) lets you move up to 1000 photos in a minute (Based on 4.1GB transfer of photos (Avg file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes and other factors.)
  • Load apps faster with A1-rated performance (A1 performances is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type and other factors.)
  • Class 10 for Full HD video recording and playback (Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors.)
  • SanDisk Memory Zone app for easy file management (Download and Installation Required)
  • Order with your Alexa enabled device. Just ask "Alexa, order SanDisk microSD."

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Top Brand: Sandisk

Highly Rated
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From the manufacturer

m4_Desktop
SanDisk Ultra

Need more speed?

Android phone/tablet

Devices

Phone, ActCam, Drone

Full HD

Video Quality

Full HD, 4K UHD

--

Music Capacity

48 albums

--

Photos and Video

480 photos/200 mins⁶

Up to 100MB/s²

Read Speed

Up to 160MB/s²

--

Write Speed

Up to 60MB/s²

C10, U1, A1

Class

C10, U3, V30, A2

Android phone/tablet

Devices

Phone, ActCam, Drone

Full HD

Video Quality

Full HD, 4K UHD

--

Music Capacity

96 albums

--

Photos and Video

960 photos/400 mins⁶

Up to 100MB/s²

Read Speed

Up to 160MB/s²

--

Write Speed

Up to 90MB/s²

C10, U1, A1

Class

C10, U3, V30, A2

Learn More
Learn More

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SanDisk 400GB Ultra MicroSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-400G-GN6MA
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Price$62.99-23% $19.99
List: $25.99		-42% $34.99
List: $59.99		$42.99$90.92-7% $25.99
List: $27.99
Delivery
Get it as soon as Tuesday, May 7
Get it as soon as Tuesday, May 7
Get it as soon as Tuesday, May 7
—
Get it as soon as Tuesday, May 7
Get it as soon as Tuesday, May 7
Customer Ratings
4.84.8 out of 5 stars28,131
4.74.7 out of 5 stars140,645
4.74.7 out of 5 stars140,645
4.84.8 out of 5 stars86,319
4.84.8 out of 5 stars86,319
4.84.8 out of 5 stars86,319
Easy to install
4.6
4.7
4.7
4.7
4.7
4.7
Storage Capacity
4.5
4.6
4.6
4.6
4.6
4.6
Value for money
4.5
4.5
4.5
4.5
4.5
4.5
Durability
4.6
—
—
4.6
4.6
4.6
Easy to use
—
—
—
5.0
5.0
5.0
Sold By
Memory-Warehouse
Amazon.com
Amazon.com
Amazon.com
QuickWare
Amazon.com
flash memory type
Micro SDXC
Micro SDXC
Micro SDXC
Micro SDXC
Micro SDXC
Micro SDXC
memory capacity
400 GB
256 GB
512 GB
512 GB
1 TB
256 GB
speed class
class 10
class 10
class 10
class 10
class 10
class 10
write speed
—
150 MB per second
150 MB per second
—
130 MB per second
130 MB per second
read speed
100 megabytes per second
150 megabytes per second
150 megabytes per second
190 megabytes per second
190 megabytes per second
190 megabytes per second

What's in the box

  • MicroSD
  • Adapter

    • Product Description

    Our highest-capacity microSD card is perfect for recording and watching Full HD video, (2) with room for even more hours of video. (7) Transfer speeds of up to 100MB/s ensure that you can move all your content blazingly fast—up to 1200 photos in just one minute. (6) Ideal for Android-based smartphones and tablets, this card’s A1 rating means that you can load apps faster too. (1) And, with its unprecedented 400GB capacity, this card lets you capture and store more than ever before. 1GB=1,000,000,000 bytes. Actual user storage less. Up to 100MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. (1) Results may vary based on host device, app type and other factors. (2) Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. (3) Card only. (5) Download and installation required. (6) Based on 4.1GB transfer of photos (Average file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes and other factors. (7) Approximations; results and Full HD (1920x1080) video support may vary based on host device, file attributes and other factors.

    Looking for specific info?

    Product information

    Technical Details

    Collapse all
    Summary
    Other Technical Details

    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.
    For warranty information about this product, please click here. [PDF ]

    Feedback

    SanDisk

    SanDisk 400GB Ultra MicroSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-400G-GN6MA

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    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    28,131 global ratings

    Customers say

    Customers like the performance, storage, value, quality and speed of the flash memory. They mention that it works well, has a high capacity and is a good value for the money. Some appreciate the read and write speeds.

    AI-generated from the text of customer reviews

    733 customers mention668 positive65 negative

    Customers are satisfied with the performance of the flash memory. They mention that it works well with their devices and provides flawless performance. Some say that it's the highest performing chip available and that it never had problems.

    "...So capacity, performance, and reliability goes without saying for these SD cards...." Read more

    "...Fortunately the card fails safe, so I was able to access it on my computer with a reader and copy all the data on it...." Read more

    "...SanDisk hallmarks: high quality, nice look, good performance, nice looks, and it, of course, comes with an adapter in case you wish to use this in a..." Read more

    "...just speculation of course!But this card performs flawless... not only in my Galaxy Note 4 phone but also in my camera...." Read more

    512 customers mention440 positive72 negative

    Customers like the storage of the flash memory. They say it has 367GB of space to store pictures and movies, with lots of room to spare. Some say the capacity was exactly as advertised and the card recognizes the entire capacity. Overall, customers say it's a very reliable storage device and the perfect size for their new Samsung Galaxy Tab S4.

    "...So capacity, performance, and reliability goes without saying for these SD cards...." Read more

    "This card has not disappointed me yet. With huge amounts of space, and a transfer read speed listed at 100MB/s, it's a card that can serve all kinds..." Read more

    "...This card can too since it also has storage space above 256gb, except unlike the 256gb card you can access the additional storage space from the get..." Read more

    "Great micro USB card with large capacity and fast speed." Read more

    422 customers mention390 positive32 negative

    Customers appreciate the value of the flash memory. They say it's a steal at the price, works great, and is worth every penny.

    "...Happy with my purchase. 100% 400GB SanDisk SD card at a reasonable price." Read more

    "...at some point need maximum storage, this is the option that provides the best value." Read more

    "...For the reasonable price that this card is, I found it to be an excellent buy. Overall I recommend this SanDisk 400 GB SD Card." Read more

    "The price was right on this product and it's not a knock off or low quality!..." Read more

    317 customers mention239 positive78 negative

    Customers like the quality of the flash memory. They say it's durable, good quality, and reads fine on different devices. Some say it makes the most reliable memory cards. Overall, most are satisfied with the performance and durability.

    "...PROS:SanDisk. Enough said. Quality and performance.CONS:Obviously, verrry slim chance of the SD card being a fake...." Read more

    "...It has all the standard SanDisk hallmarks: high quality, nice look, good performance, nice looks, and it, of course, comes with an adapter in case..." Read more

    "...Sandisk is the most reliable IMO and it's amazing they remain at the front of the pack...." Read more

    "...Recently the card died on me with little notice. My phone listed it as "corrupted" then stopped recognizing it...." Read more

    213 customers mention176 positive37 negative

    Customers like the speed of the flash memory. They say it has a large capacity, and the chip responds with no noticeable latency in apps or games. They appreciate the combination of speed and density offered, saying that 1800 camera photos appear rather fast. They also mention that the sustained transfer rates are great, and that it allows for so much more data, pictures, and videos in all of the devices in their family.

    "...all the memory being "seen" by the player, and some very good transfer speeds...." Read more

    "...may be in burst abilities for use as internal memory but sustained transfer rates are great!......" Read more

    "I love it! Works great in my Galaxy Note 8! Fast enough that I can throw pretty much anything at it...." Read more

    "Great micro USB card with large capacity and fast speed." Read more

    111 customers mention108 positive3 negative

    Customers are satisfied with the compatibility of the flash memory. For example, they mention it works well with their Nintendo Switch, is excellent, and fits plenty of downloaded games. Some say it's very compatible with their FiiO M11 media player.

    "...It also works great for the Nintendo Switch, so if you need substantial storage for cheap, this is your card...." Read more

    "...Anyway...This works just fine in a Nintendo Switch. It recognizes the entire capacity of the card...." Read more

    "a great value; purchased for my Switch. perfect for all my downloaded games." Read more

    "...small data sizes of Switch games, I am able to have dozens of games installed at once, which is super convenient...." Read more

    61 customers mention61 positive0 negative

    Customers find the flash memory easy to use. They mention it's simple and user-friendly, with no problems with setting up. Some say it'll work perfectly with their Nintendo Switch and is convenient.

    "I bought this for extra storage on my Nintendo Switch. It is easy to install and is already formatted correctly to transfer memory on my switch...." Read more

    "...Super simple. Next to no effort. You are good to go no glitches or hang ups...." Read more

    "...my Hero5 Session and the device recognized the card right away, no need to format...." Read more

    "...The item works great! Simple and easy to use! Get it for anyone looking into video editing, filming, or even video games for that Nintendo Switch!" Read more

    29 customers mention6 positive23 negative

    Customers are dissatisfied with the readability of the flash memory. They say that it would not read and could not format. They also mention that it started getting read/write failures after a year.

    "...After 3 years & 9 months this MicroSD card started having read/write errors. The 1 star rating is for this card only...." Read more

    "...Con: Mine started getting Read/Write failures 1 year in...." Read more

    "...The 8th Gen Kindles will not read it as it comes. You will need to reformat the card to FAT32...." Read more

    "...Seems durable, good quality, and reads fine on different devices, just make sure the device you plan on using it for can handle that much extra..." Read more

    Cheap way to add storage to some computers...
    5 Stars
    Cheap way to add storage to some computers...
    I bought this to add storage capacity to a SurfaceBook with a 512GB SSD. It adds 366GB of usable space which shows up as a separate USB drive in my computer's base directory. If you have a computer with a dedicated SD card slot, this MicroSD card can expand your laptop's storage without protruding beyond the edge of the notebook chassis if used with an adapter in place of a regular SD card (see the photos for how this works).And now the price for 400GB is a semi-reasonable $249, making this roughly $.62/gb. The cost per gigabyte sweet spot seems to lie at the 32-64GB level, with SanDisk storage in that size range costing $.30/gb and Samsung roughly the same. At this price, it's cheaper to throw a MicroSD card in a slot than to try to add storage to a non-upgradeable computer like the MacBook Pro or SurfaceBook. But if you do go this route, remember that flash memory of this sort is less-reliable than a disk. Don't use it for irreplaceable or mission-critical content.I use this BASEQI Aluminum MicroSD Adapter for Microsoft Surface Book & Surface Book 2 13.5" adapter. Other manufacturers also make adapters that permit a MicroSDXC card to be used in place of an SD card as a semi-permanent addition to laptop memory. The adapter allows the card to fit entirely within the laptop frame (usually impossible with full-size SD cards in modern laptops which only provide shallow ports), becoming nearly because the adapter's slim exterior portion matches the laptop's surface. Search the adapter maker's other listings and you will find similar products for MacBook Pros with SD card slots.Throughput between this and the laptop's internal SSD is passable, not great, averaging about 30 MB/sec with a folder filled with pictures. See pictures below for input and output benchmarks.
    Hide
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    Top reviews from the United States

    Broc M. Krietemeyer
    5.0 out of 5 stars Lots of storage (400GB) and impressive speed from SanDisk, a trusted brand
    Reviewed in the United States on January 18, 2019
    Verified Purchase
    Not much to say other than to remark on the validity of the SD card I received through Amazon actually being from SanDisk.
    SanDisk is one of, if not the biggest, SD card manufacturer and the quality of their products is the golden standard. So capacity, performance, and reliability goes without saying for these SD cards. However, I have read quite a lot of reviews claiming that the ones they received were imposters and, while I do not claim they are mistaken or not, I can say that my 400GB one I received from Amazon seems to check out through every test I've run it through.
    Amazon has quality customer care and product replacement/return policies for the ginormous corporation they are, so if you have any issues with your product I'm sure you can get it worked out within reason. There are a lot of different resources for checking the validity of SD cards online and you can find them all with a simple search on a quality search engine website. If you are concerned, I suggest going that route or contacting local IT support to see what they can do for you.

    PROS:
    SanDisk. Enough said. Quality and performance.

    CONS:
    Obviously, verrry slim chance of the SD card being a fake. Technology is amazing these days and there are people out there driven to make a quick buck if they've got the materials and the know-how. Even giants like Amazon can fall victim to these numerous and unethical kinds of practices.

    Happy with my purchase. 100% 400GB SanDisk SD card at a reasonable price.
    Helpful
     Report
    Ryan
    5.0 out of 5 stars Lot of storage, good customer support
    Reviewed in the United States on February 3, 2022
    Verified Purchase
    I bought two of these on sale about 2.5 years ago. One of them went in my phone, where I used a lot of storage for multimedia I would watch on long trips. Recently the card died on me with little notice. My phone listed it as "corrupted" then stopped recognizing it. It could not be formatted, erased, or written to. Apparently this happens when it reaches the end of its life cycle, which seemed a little soon to me. Fortunately the card fails safe, so I was able to access it on my computer with a reader and copy all the data on it.
    Typically, I wouldn't consider a storage device like this to be very good if it dies after 2 years. Again, this wasn't damage to the card, but the end of its life cycle. But checking my purchase history on Amazon I discoveredit came with a 10 year limited warranty. I contacted customer support and discovered the warranty covers this. A replacement card is being shipped. Total time is going to be about a week to a week and a half, which I consider very reasonable. While it's unfortunate I had a serious problem with one of my cards, I always appreciate good customer service and a company that stands behind its products and honors their warranties. I believe anyone could buy this product with confidence.

    My other, less used card, is still functioning fine.
    2 people found this helpful
    Helpful
     Report
    Ray
    5.0 out of 5 stars We're Finally at About Half a Gb for Micro Storage! Yea!
    Reviewed in the United States on June 1, 2018
    Verified Purchase
    This card has not disappointed me yet. With huge amounts of space, and a transfer read speed listed at 100MB/s, it's a card that can serve all kinds of purposes—assuming your device supports this storage amount—for photos, music, videos, and just plain old file storage. I am using mine with the new  Sony NW-A45/L Walkman with Hi-Res Audio, Moonlit Blue (2018 Model) , and it has worked marvelously so far, with all the memory being "seen" by the player, and some very good transfer speeds. I have not yet specifically tested the actual speed, but will do so soon with the Black Magic speed tester, and will update this review with that report.

    Right now (mid-2018) this card is running at just under $200. I don't suspect it will drop anytime soon, since its the only guy on the block, so if you have a use for it, you might as well get it now. I doubt this will even be marked down much towards the end of the year, although I could be wrong, due to its unique status. Having said that, if the price is still too high, keep an eye on it, because there MAY be occasional rebates, two-day sales, etc.

    It has all the standard SanDisk hallmarks: high quality, nice look, good performance, nice looks, and it, of course, comes with an adapter in case you wish to use this in a camera that takes the standard sized SDXC cards. I can put almost my entire lossless audio library on this one card, which is amazing. Five stars, and an update soon with the results of the speed test I plan to perform.
    3 people found this helpful
    Helpful
     Report
    A. J.
    5.0 out of 5 stars Compatible with everything I've tried and super fast for 4k Video!
    Reviewed in the United States on April 24, 2018
    Verified Purchase
    Bought this for my Paralenz underwater camera that shoots up to 4K 30fps.

    My camera manufacturer says 128gb V30 is the required max but this card is rated for a min of 10mb/sec & and the write speed is undocumented publicly after contacting Sandisk, with transfer speeds to 100mb/sec.

    Maybe they won't release write speeds because it performs so well they don't want it competing with their faster rated cards?.... just speculation of course!

    But this card performs flawless... not only in my Galaxy Note 4 phone but also in my camera. Leave it formatted in the default exFat and your good!

    After much research it appears its only weakness may be in burst abilities for use as internal memory but sustained transfer rates are great!... so much so that 4k @ 30fps video was no problem in testing.

    I'm also astonished this card works so well in my Note 4, I had a 128gb Sandisk in before and this definitely feels faster.

    At this point I have the highest recommendations for this card.... you can now store mass amounts of 4K footage.... according to my tests so far, about 10+ Hrs of 4K @ 30 fps!

    I've found other brands often give similar speeds as compared to Sandisk but fail miserably long term in reliability.... Do you really want 400 GB worth of stuff lost because you wanted to save a few bucks with another brand?

    Sandisk is the most reliable IMO and it's amazing they remain at the front of the pack.

    It's not the fastest dog out of the gate that wins, but the one who can make it to the finish line first!

    I own 3 of these now.
    I can film 2.7k @ 60fps and put 17 one hour dives in a week long dive vacation and I only use about 180gig!

    Its great not having to tote a big laptop on my trips!

    I have one just for backup too on my trips .. Haven't had to use it yet!
    41 people found this helpful
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    Top reviews from other countries

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    Ton.
    5.0 out of 5 stars Top
    Reviewed in the Netherlands on April 21, 2024
    Verified Purchase
    Top
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    taka48106
    5.0 out of 5 stars 安定している。
    Reviewed in Japan on January 17, 2019
    Verified Purchase
    エラーもなくカメラ写真やダウンロードした映画や動画、音楽ファイルの保存に役立っています。
    まだ使い始めですが、今の所大満足です。
    One person found this helpful
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    Amazon カスタマー
    2.0 out of 5 stars 書き込み遅し
    Reviewed in Japan on December 14, 2019
    Verified Purchase
    同じSandisk Ultra Microsdxcの２００GBのマイクロｓｄカードもありますがスマホ装着時の書き込みは圧倒的に遅いです．
    3 people found this helpful
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    Raymond
    5.0 out of 5 stars Working great and definitely authentic. Just make sure its sold by Amazon SG or Amazon US.
    Reviewed in Singapore on November 18, 2020
    Verified Purchase
    Tested the complete card with H2testw tool, 100% passed after some hours.
    Using it both in my Nintendo switch and switch lite with no issues!
    Report
    Roger Moritz
    5.0 out of 5 stars speicher karte
    Reviewed in Germany on April 8, 2024
    Verified Purchase
    gute speicher karte top
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