What are the safest steps to formatting a micro sd card for a new game after writing a game on it already using win32 disk imager? I think I've done one wrong already and corrupted a previously working 16GB Sandisk Ultra class 10 micro sd card already e-mailed the support for an RMA
well: you shouldn't realy need to format it, as writing the image to the card is a bitwise, low level, straight to the hardware operation without using any filesystems.
you might have a bad dump (check this by using another game, preferably one you know to work)
you can also try to do a bitwise overwrite of the sdcard, the easiest way to do so is to use the panasonic sdformater and select under options -> format type -> FULL (erase off).
this will take quite some time though, as this will need to write the full size of the card.