This review is specifically for the item SanDisk Extreme 128GB microSD UHS-I Card with Adapter - 160MB/s with SanDisk MobileMate USB 3.0 microSD Card Reader. My card was shipped from and sold by Amazon.com. The top review for this card would have you believe the product I received, based on physical appearance, is fake. The speed tests and H2testw program appear to indicate it achieves the advertised speeds and has the correct capacity using the bundled USB 3.0 card reader in a USB 3.0 port on my desktop Windows 10 PC.
If this card is somehow "fake" it is quite impressive. I'm sure there are some fakes out there, but if you do decide to buy this card it might be worth performing your own tests before deeming it fake based off the looks alone (assuming it's not an incredibly obvious fake).
Replaced a 64GB memory in my Galaxy S9+, of the same brand just not extreme.
Now my phone has more storage space than my two best laptops... of course you know, I will buy more.
This, so far, is the holy grail for portable storage... this has more memory than the SSD in my ThinkPad W530 workstation... blows my mind. As far as quality goes, you can't beat SanDisk, they been around since the beginning in the SD card arena.
This little tiny thing, is so tiny, I could put it up my rear end, after filling it with days worth of videos and unending images... doubt I will never need this much room but... I like to record a lot. This thing pretty much turned my lowly cell phone into an absolute powerhouse.
I purchased 4 of these to use in my GoPro Fusion and GoPro7 cameras, and I couldn't be happier. Not to mention that the price was right!!
I got this card for my galaxy S9. It had a very good chip installed in it before (Samsung 256G Evo Select) which I liked. But I wanted to max out my S9 both in its 400G max capacity and in the speed to record. This chip/card does record 1080p 60fps with no problems at all. It also does 4k video well. (I tested it in one of my cameras.)
The only place it fails is when I'm doing rapid burst pictures in my phone. The camera says it can't do rapid burst when using an external card and switches burst control over to internal memory automatically. But to be fair the Samsung chip I had did that too. So apparently it's something built into the camera app or S9 hardware path that just assumes no external chip can do it, even though both the original Samsung 256G and this even higher spec Sandisk 400G are top of the line spec wise. Not really a problem for me as I don't generally take bursts of photos but mentioned it here in case you do. Frankly, if I needed that, I would get an SLR camera instead of using my phone.
When I tried this memory in my Sony video camera, (which is only supposed to support 256G), it saw all 400G and it worked flawlessly and I filled it with combinations of pictures and videos.
I also tested this card as an external chip in a USB 3.1 adapter with my computer. It showed 155MB/s read and 88MB/s write at 64k transfer sizes for a duration of its entire 400G. That's close enough to its listed max speed and I'm happy with that. Now you need to understand, that's testing with all conditions being nearly perfect for this chip. It's highly unlikely to perform that good in the real world moving your data around. I noticed that if you go below 64k file transfer sizes or don't use high speed ports like USB 3, you see much less speed. Most newer cameras and phones will best utilize the higher speeds. But if you use this card with older SD adapters or USB 2.x or computer SD card readers you'll be disappointed with any fast SD memory card. ALL the pathways through adapters and ports and cables and hardware have to support the higher speeds or testing will just show you the top speed of the weakest link in your data pathway.
But let me tell you this card is amazingly fast to copy files to or from if you have the proper equipment to support it!
When I got this chip, I first removed my Samsung 256G and installed this card instead (blank). Although it showed up right away as 400G in the S9 phone, I had the phone reformat it anyway as I just like to be sure its setup by the particular device before testing.
I then used a USB3.1 adapter to plug the phone into a USB3.1 port on my computer. I already had done driver setups for this phone before.
I decided to fill the 400G card with music videos and some personal videos and my docs and my sound files and music. I setup a single copy from the PC to phone external memory of about 340G. (The card actually formats to 367 computer G even though that's 400G of real memory.) Last time I did 256G like this, it took me few hours to complete. So I started the copy to the phone and walked away thinking I'd come back in several hours or if I heard an error beep. I did notice it was copying files fast.
After about an hour and 15 minutes, I heard a bleep from the computer saying it was done. I was a bit frustrated because I thought I was hearing an error beep. So I began to check where in the copy had died. What I discovered was, it really had copied all 340G in 1.25 hours! I couldn't believe it and rechecked to see all the files were indeed there! That's including almost 200,000 photo files that usually slow down backups or restorals to a crawl. Never had a write of major data speeds be so fast!
So in case you can't tell by now, I love this card in my Galaxy S9 phone. I was happy with the Samsung 256G memory card but thrilled even more by this Sandisk 400G upgrade in speed and storage size. Granted, I have 6TB of media storage alone on my PC that I'll never get all of on a phone. But now, thanks to this card, I've got all my docs, sound files, music videos, and unwatched videos ready to watch on the phone. Couldn't be much happier with this Sandisk 400G Extreme microSD card.
One thing you should be aware of though is you will definitely use your device battery up quicker with this card installed. It sucks my Samsung Galaxy S9+ battery down about 40% faster the the 64G internal memory by itself. But even then, it still stays up most of the day and night before charging. Of course if you do a lot of copying or moving files, it's likely to last slightly less without recharging.
Summary
- 1kB sustained: 10 MB/sec
- 4kB sustained: 12MB/sec
- 1MB burst: 22MB/sec
- 1MB sustained: 13MB/sec
Whenever new large capacity cards are released on the market, I am always concerned with scammers taking advantage of people and slapping a label on a smaller card. When I received it, I tested the card with a simple script that create 360 1GB files in 1kB blocks, like so:
`for i in $( seq 1 360 ) ; do dd if=/dev/zero of=sd-text-${i} count=1048576 bs=1024 ; done`
One of the main thing I'm testing for is insuring that the card isn't 128GB ro 256GB in this case, because very few people will actually take the time to do so, stick the card in their phone/camera/game console and find out they run out of space early than expected when it's too late.
I'm happy to report that though it took a really long time, the card has now 386 GB of test data.
It wrote at 10.468 MB/s on average with a standard deviation of 1.166 MB/s.
This is a known torture test because small blocks challenge the way the underlying flash is organized.
A more realistic test would be to write in 1MB blocks in bursts of about 20MB which most cameras do for example (they typically buffer up and then dump their buffer to the SD card, which why for example burst photos are faster in the first second or so)
This test yielded a speed of 22.641MB/sec
I hope this helps
Feature Product
- 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)
- 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)
Description
With the SanDisk Extreme 256GB(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-400GB: 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-400GB: A2 performance is 4000 read IOPS, 2000 write IOPS. Results may vary based on host device, app type and other factors. | (8) Read only; based on internal testing. Results may vary based on host device, file attributions and other factors.
Just got the card this morning. Speed almost matches or slightly exceeded the rated speed on matching USB reader from SanDisk: 160MB/s+ read, 95MB/s+ write. Performed very decent on built-in SD Slot: 90MB/s+ read/write). Both results from the same laptop: Macbook Pro Late 2013, 2.4GHz Intel i5, 8GB RAM, USB 3.0.
I copied over 120GB of data from another card (with dd between two /dev/rdiskx). It sustained 49MBps+ for the *entire* write. The speed was probably limited by the source SD Card.
I was running Windows 10 on VirtualBox using the SD as the RAW disk. Windows 10 is fast enough to be usable. (Samsung EVO Pro Endurance was way too slow to be usable, in comparison.)
This is like putting an SSD on your Raspberry PI 3/3+ or similar embedded device. Read IO's 2500/second- will saturate the SD Card interface of any device it is put in. Make sure, though, that your device is capable of that many IOPs in order to take advantage of it. Some devices aren't that robust- so an A1 or even just an ordinary card will do.
Cameras are iffy for an A2 rated card. Smartphones, tablets, embedded computers, however...are quite capable of using it to the fullest possible. You should know a bit of something of what your device is capable before buying this class of part, expecting amazing things out of it. It's an, "It depends..." type thing. My application is thoroughly unleashed. My phone was. My tablet was.
I recently installed a 500GB Samsung 860 Evo so I could keep all my pics and music on my laptop, which I had stored on this to make the cloning process faster and because I wanted and independent backup. My 128GB chip sustained a read rate of ~ 140MBs for about 5 minutes restoring my 5MB average music files to my SSD.
This is a MUCH more flexible way to buy external memory than dedicated USB drives as you can swap the chips out, tape them to a 3x5" card with comments, and put your backups in a card box. You also only pay for the memory, and have all different size choices, so you're not always stuck with an inappropriately sized external drive.
Using this combo was a revelation.
After lots of research and trying to find a seller that i had faith in not selling a fake I'm glad I purchased it here. Got the new 256gb A2 rated card for my galaxy s9 plus and when the galaxy s10 comes out I'll use this as well as the A2 rating is the best you can get . Very satisfied with my purchase fast shipping as well
This item looks to be authentic (i.e. not counterfeit) as it was sold by and shipped by Amazon directly and not a 3rd party. The item is cosmetically identical to the photo shown. The retail packaging looks legitimate and the printing/details on the card itself look authentic. Using it in an Android-based phone for additional storage capacity, and to allow faster photo and (mainly) video storage. 64GB should be more than enough for recreational use. Mounted right in and seems to work well, although I did not do any sort of read/write performance test beforehand. I'll assume the card's read/write speed capability exceeds that of the phone itself. As long as it isn't noticeably slow or have any issues no need to scrutinize further.
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