ok i have done a lot of test with my sd card and found a way to get them works without any bug.
you just need to format it in ext4 linux format, put your files on it, turn of your kobo, put the card in your kobo, then turn on your kobo....
tested with my 2 sd card and read about 15 cbz file without any card bug.
as ext4 isn't used by windows you need to use linux to use it, calibre linux version works well, i use it for 4 day in a virtualbox with ubuntu on my windows 7.
it's not the simpliest way to do it bug i have no more bug with my sd car in 1.9.16 ^^
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