This item is a fake. I've encountered others, but this is the first on Amazon.There are others, so beware. It initially reports the proper storage size, then once written to it usually crashes. You can try to reformat it and it will not work. Stick to name brands.
Reasonably priced. Seems to be reliable and as fast as other more well named brands, just had one incident where the card disappeared from showing up on my computer, but there's a chance that could be a wire or connection issue not the card. Had a few VR headset crashes, but that could be the headset or apps fault. 128gb Card shows 117 gb useable with 11gb non useable buffer for those calculating actual usage space.
I saw a lot of people report that this Micro SD doesn't report the correct sizes, and I had the same issue. However, I tried the micro SD card in my phone and found that it was in fact 128GB, 115.64GB after reserved. I then tried a few other adapters for my PC and found that the adapter was at fault, not the card itself.
I tried this with a Sandisk SD card and got the same errors until I put it in my working adapter or in my phone.
Speed is decent though you have to keep in mind, something the other reviewers might not know, is that their are a lot of factors that play into the speed of this device. Are you using a USB 2.0 or 3.0 slot? Is your Adapter USB 2.0 or 3.0 compatible? What files are you transferring? For me when I transferred 25GB worth of files its speed was a consistent 10MB/s (With spikes) over a USB 2.0 adapter in a USB 3.0 slot which is generally what the lower speed rated cards should do.
So if the card isn't reporting its full size, try your phone or a different adapter. The cheap adapters I was using were able to report accurate sizes for 32GB or under but for cards 64GB and higher it caused problems. Also don't just run a benchmark and determine that's the speed of the card. Different files impact performance and USB versions impact performance and a benchmark doesn't substitute actually using the device to determine its speed.
My first experience with SP products. It reads/writes quick. It fails to recognize about 3 out of 5 times device is powered on or woken from sleep. Its better than a $13 microcenter card but really for the hassle, you might as well spend $4 more and get a samsung evo card that will have 0 issues ever. Card comes Fat32 formatted, required to be reformatted to ntfs to load movies larger than 4gb onto it.
It says it's compatible with android tablets, but that apparently excludes Kindles, so choose a different one for those. It said it wasn't compatible when I inserted it, but gave me the option for it to be converted to what a Kindle needs, so i just went with that. I was trying to save money, but chose the wrong one. It also informed me not to convert if my main usage would be transferring data or photos to another device. It seems to work fine, but I suggest you buy a different brand and type for Kindles. I'm not that savvy for this type of thing. For presentation, I based that on their description, not the quality of data or photos. To me, they look fine -- no difference that I see in comparison to the SanDisc I have in my older HD 8.
This card works for me perfectly. It works well and holds plenty of storage. I had ran out of space on my phone ( due to many videos) and urgently needed a new larger storage SD card. Not only was I able to transfer everything over to this new SDXC card, but the transfer went over smoothly. Works every time, seems fast with no speed problems when writing 4k video onto my card. Read seems also fast enough. I have used it on my Samsung Galaxy S9+ S10, dash cam, and my wireless door cam. Works flawlessly. No complaints so far. Works the same as my other Samsung sdxc cards which I paid for even more ( for no apparent reason ).
I got both this 128G SP and a Samsung EVO Select 128GB. The Samsung was $20, this one $15. Samsung's test showed write 26MB, read 40MB, compared to write 20MB and read 40MB for the Silicon Power. Read speed might be limited by my card reader/PC, but there is no excuse for the lower write speed.
This inexpensive micoSD card works perfectly. The only (minor) issue is that the actual usable memory is 118GB, kinda low for an SD card. For most people, I'm guessing this is not an issue. Using mine in a Fire Tablet, so no memory critical issues for me. I'm happy with this purchase.