They are from more than decent UK retailer based on reviews, packaging was immaculate and I would say they are genuine Sandisk products. Even coupon code for some software was included which I haven’t checked, I would guess that false products neglect things like this. I do oppose advice seen on these forums to search for high priced Sandisk products, would that really be some warranty?!
Anyway, I’m here because all three are slower than stated. Some people on Amazon reviews claim that they achieved highest speed.
Microsd cards passed h2testw_1.4 test with speeds 64 MBps
USB stick passed h2testw_1.4 test with speeds 59 MBps
Large file copy in Windows 8.1 speeds: 55 MBps read, 75 MBps write, USB stick 55 MBps read& write. So its pretty far from 245 MBps advertised and microsd cards aren’t perfect either. On same USB 3.0 port 2.5" 5400 rpm HDD goes up to 80 MBps which is great.
So, they are some doubts and my subjective experience in using them on my tablet, smartphone and PC is unsatisfactory.
_Friend, I congratulate you for their thoughtful observations, and your generosity, to share with the user Community of SanDisk. _
1- With regard to the cards , I see that the reals values, that you measured,are near of the theoretical values reported in the packaging and on the official website of SanDisk.
The reals speeds of the cards, improve on a laptop, plugged directly its the port-card (not USB card-reader).
Cards were inserted in Card reader slot with SD card adapter of course, laptop is equipped with Samsung EVO 250 SSD so no waiting there and I tried USB flash drive on 4 PCs.
Sorry, if the above steps have not solved the problem, do not grieve more, contact SanDisk Technical Support who will replace the device, if it’s authentic and is within warranty.
Link: http://www.sandisk.com/about-sandisk/contact-us/
Hi Dorepac,