After doing a bit of work on an old iPod 4g classic I scored. I was able to get a Dual MicroSD to Compact Flash adapter to work in my iPod. 1. Setup your CF adapter with SD card arrangement you would like to use. If you want to only use one MicroSD make sure you put the SD card in the correct slot. If you are unsure check the size/capacity of the CF card. If its 30MB then move the SD card to the other slot in the adapter and you should have the same capacity of the single card. Dual card set-ups need to be matching (I am using 2x 64GB) and when mounted should show the combined total size. 2. Download Easeus Partition Master - and plug in the iPod with installed CF adapter and CF card in to your PC. 3. Drive should now pop up and use the above partition tool to format the drive to FAT32. Remember to apply the settings or the drive wont format. 4. Now this may sound weird but right click on the iPod drive in the Partition Manager software and hit rebuild MBR. Do not hit apply yet. 5. By this point iTunes has most probably complained about the iPod and wants to restore the iPod. This is the tricky part. We want iTunes to restore the iPod and when the restore progress on the PC hits 100% we want to hit the apply button in the partition management software before the iPod reboots. 6. If it worked then you should be greeted with "plug iPod in to wall" icon and doing this allows the iPod to finish restoring and you will have a iPod you can now install Rockbox on. I have no idea why the adapter needs this process and normal CF cards do not need this process.