This is an old revision of the document!
We have noticed that a high percentage of file read issues resulted from user deleting gcode file right before adding new gcode to the same SD card. We are still verifying the cause and for now, we recommend user not to delete files from SD card. If you need more space, just format the card using the SD format application here: https://www.sdcard.org/downloads/formatter_4/
We will follow up on the situation