Brand new SD card - says card is full? Nikon D40
I ran into this exact issue (64GB Sandisk SD not working with an old Nikon D40). The problem is that the camera requires FAT32 formatting, which is not supported on partitions greater than 32GB (i.e the 64GB stick). A format from the camera attempts to repartition all device space (64GB) which is incompatible.
I solved this by connecting the SD to my laptop, opening the windows disk management utility (diskmgmt.MSC), deleting all partitions on the SD (right-click, delete partition on all allocated space), the right clicking the unallocated space, add simple partition, then allocating only 32GB and using FAT32 as the format (any more and windows will only provide exFAT as an option, also not compatible with Nikon D40). Plugging that into the camera and NOT reformatting from there worked.
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