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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.