If the USB transfer speed is the main issue, it might be improved by replacing the Glo HD's internal micro-SD card with one that is faster for large files, such as a good class 10 card. There are instructions in the Kobo subforum for doing this.
You would just need to be careful to choose a class 10 card that is also fast for small files, because the small file speed can affect the performance of the software on the device, and some class 10 cards are actually much slower than class 2/4 cards for small files.
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