
The Sandisk 64GB SD card was working fine for 13 months, and then an I/O error occurred, resulting in a complete loss of the ability to transfer files to or from the card led. I have contacted Sandisk for a warranty replacement. Purchase documents required (thanks Revain), card serial number (infinity small on back of card) and photos with readable serial number. After submitting the initial requirements, they ask a series of additional questions. If Sandisk backs up its warranty with a replacement SD card I'll update this review. The Sandisk warranty replacement process took a few weeks, but they replaced my failed 64GB Sandisk SD card for free. Thanks Sandisk