Corrupted SD card in use as internal storage, how to transfer data to new card?

[BertG]

Did you use it as internal storage as well?
The size of the SD can not be said to be the general cause for your problem, as you can see in this thread:

List of compatible microSD / SDXC cards for FP2

ATTENTION!! This wiki is just a list by FP2-users. It is there to share experience with MicroSD cards. It is nothing official by Fairphone. Fairphone does not sell any of these cards. Which MicroSD cards do work and which do not? Fairphone does not have the capacity to test MicroSD cards and is not in a position to endorse the use of brands or types of cards. So I hope that the community can help to make a nice list of good MicroSD cards. Although Fairphone is said to support MicroSD card…

I have a SanDisk 256 GB card up and running perfectly fine.