Q: SD card XC 1 not recognized by iPad or iPhone

How has the card been formatted ? From http://support.apple.com/kb/HT4101 :

• Picture Transfer Protocol (PTP)
• Mass Storage Device protocol
• SDSC
• SDHC
• miniSD
• microSD
• MMC
• SDXC (supported only when not formatted as ExFAT)

So if it's formatted as ExFAT then it won't be recognised.

You can check how it's formatted and reformat it with your computer. However, going by another user's experience, when you reformat it, you'll lose about half the capacity of that card. So if you need 64 gig, I'd return it and buy SDHC in stead of SDXC

You can use a program like this

http://www.partition-tool.com/easeus-partition-manager/help/about.htm

I need it to fix a similar problem with an Airstash device and a 64gb SDXC

Will take any SDxx card as long as it is Fat32 and windows will not format that on this card

So above program  does and card now works perfectly at full capacity .I used the free version and it worked fine