R-drive is a windows program - you'd rather use the native program (linux, or Kobo itself); also, I don't see the fat32 partition - the 3 partitions mounted by default are all ext4.
I did the most conservative thing - a clone to an identical (8GB) micro-SD card, using Kobo itself (I gave the "dd" command 3 posts ago). I'll try to test it outside of Kobo for now, but also will have to disassemble Kobo one more time, for a real test.
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