If USB access does not work, what will work for sure is to take the microsd card out of the DR (unscrew at the back, be careful when re-inserting not to insert the card under the actual slot), and access it via a card reader, (usual SD card readers will do if you have a suitable adapter piece)
Alternatively, if you do not have a card reader, insert another (preferably empty) microsd card into the reader and try if it boots all the way, after that you can format the new card in settings, and disable thumbnails generation. (you might even try if the old card now works).
Personally I have never waited for the device to run out of charge before taking the card out.
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