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My MacBook Pro 10.6.8 with a Delkin card reader won’t read a ExtremePro 64GB SD card. I can see the card in the Disk Utility but it won’t mount on desktop.

I am using it with a Sound Devices 664 mixer/ recorder and this card has been approved by Sound Devices. Any idea how I can get the card to mount so that I can copy my audio files over?

Thanks.