I upgraded a 2nd gen iPod mini this week to 64gb. I decided to try a SD to CF adapter card that I got on Amazon from DigiGear. The adapter supports SD XC cards. I used a Transcend 64gb class 10 card. The iPod is working great. The only issue is the write speeds using a SD card are slower than using a CF card. I really don't care that it's slower, I rarely change the content on my iPod.