I have installed exfat-utils and fuse-exfat (I first tried exfat-fuse but had the same results) and have mounted the drive (sdk in this case) to a folder. I mounted the card using the following sudo mount -t exfat /dev/sdk1 ~/mountlocation

The card is a lexar 64gb and the card reader is a lexar professional workflow XR1 USB 3 card reader.

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Sony xqd card reader not working