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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.
I ordered two of these in December of 2015. As of today, August 13, 2018, both of the SD Cards have failed to be recognized by any device I put them into. Visited Silicon Power's website and requested a replacement as they are covered under warranty. FYI: The "Lifetime Warranty" that is advertised on Amazon is actually only five years according to Silicon Power. I'll update this once I get an answer on the replacements.
I bought this to burn an image of my RetroPie so I will have a backup. The original is on a Sandisk 128GB SD. I created an image of the original and even was able to shrink it by about 1GB. I still would not fit on this SD card. the Sandisk card formats to almost 1.5GB larger capacity. None of the 128GB cards actually format to 128GB. This one formats to a little over 117GB. If that is not an issue for you this card might be ok. I will have to send it back as I have no use for it. I should have spent the extra $1 to get the Sandisk.
Ordered one of these to download movies for my Kindle. Neither my Kindle nor my computer would recognize it. I sent it back and got a replacement. The replacement appeared to work at first, but after spending several hours downloading movies onto it, it died and would not be recognized by Kindle or computer. Sending it back for a refund.
This SD card is in my dashcam which has been exposed to prolonged daily sunlight and extreme temperature changes along with sudden swings in momentum. I own other Silicon Power products and for most things any brand will do but if it involves anything outdoors or there's a risk of dropping a piece of equipment I go with SP. I can't say for sure that another brand of SD card wouldn't perform just as admirably in my dashcam but I'm not willing to risk random corruption because of heat, condensation, etc.
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.