On 8 cards purchased from SanDisk, 8, 16 and 32 GB, 95 Mb / s, which work perfectly, this card, and it is pure coincidence does not work live on my mac, I am obliged to read through an external reader. But not reported in due time to have it replaced as well by Amazon which sent me back to SanDisk who asked me questions that revolve repeatedly. So I gave up.