Strange ... I'll try looking further into this to see if I'm able to update it.
The "from a mac" refers to connecting the SD card to a mac, through a card reader or any other hardware. The lovely mac is configured to attach volumes automatically and for all volumes that allow writing to it will automatically create a number of files such as ".DS_Store", ".Trash" etc. Hence the problem of making sure the only file on the SD card is the .bin file
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