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This is a genuine SanDisk sd card and held files to its full size without file loss.
It writes at about 30mbps on my PC. The 'up to 120mbps speed' claim on the packaging is READ SPEED not write speed. This is a game all card manufacturers play on us. (To get a card with high write speeds you need to pay much more - look into the write details not the headline claimed 'speed'.)
This is a great card for the price and if you just want to take photos or Full HD video it will be fine. For 4K video or high bit-rate, 50fps FHD you should use a U3 rated card instead.
I take a fair amount of photos, and tend to buy a replacement card of this brand about once a year when the old card gets full. They are good quality, contain loads of images, and are fine for video filming too. Over the years the cost of these has come down significantly, and they represent good value for money. They do the job required very well, so I am a satisfied customer
I have always found SanDisk Memory Cards to be reliable, and have so far never let me down. I have used them in my DSLR cameras for more than 10 years and now in a wild life or 'trail camera' with the same outcome. However it is worth noting that some equipment has a limitation of the memory size that it can address so always check before ordering.
When used in Browning Recon Force 4k trail cameras, these SanDisc discs created corrupt mp4 and jpg files in up to 50% of images taken. The same problem did not arise in the Browning when using most other makes of disc although I did have the same problem with some super-cheap discs, which these ScanDiscs are most definitely not. However, these SanDiscs worked OK when tested in a Cannon SX71 camera and a Bushnell E3 trail camera and in general PC usage. Am in discussion with Browning on the subject. I hope this is helpful. Allan Bantick