You're exactly right - i tested it a few times now and all the epubs work on the device storage perfectly
However, the errors are constant on the memory card (Kingston 8 gb Micro SD)
Either there is an issue with the card, or there is an issue with the calibre sync perhaps? Can anyone recreate this?
I tried it on another MicroSD card, also 8 gb, to see if it would occur on another card, and it didn't work either - same errors - very strange