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Your problem seems similar to what I and some others have experience with the Hanlin V5 (PocketPRO). The PocketPRO is supposed to be USB2.0 capable, and most of them are. However, there are some that have a very high error rate when running at USB2.0 speeds. If you try to copy books onto the device when the USB2.0 connection has a very high error rate you can end up corrupting the FAT16 file system. Through a bunch of trial and error, I found that my PocketPRO would work flawlessly at USB1.1 speeds. Since USB1.1 worked great I ended up using an old USB1.1 four port hub to force all USB communication with the PocketPRO to be at the lower speed, and it works great now.
IF your PocketPRO FAT16 file system has been corrupted by poor USB2.0 performance, you will need to reformat the internal storage. If you need to do that do NOT do a fast format, do a full format.
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